chore: bump up rustc version to v1.78.0 (#6813)

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This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [rustc](https://togithub.com/rust-lang/rust) | minor | `1.77.2` -> `1.78.0` |

---

### Release Notes

<details>
<summary>rust-lang/rust (rustc)</summary>

### [`v1.78.0`](https://togithub.com/rust-lang/rust/blob/HEAD/RELEASES.md#Version-1780-2024-05-02)

[Compare Source](https://togithub.com/rust-lang/rust/compare/1.77.2...1.78.0)

\==========================

<a id="1.78.0-Language"></a>

## Language

-   [Stabilize `#[cfg(target_abi = ...)]`](https://togithub.com/rust-lang/rust/pull/119590/)
-   [Stabilize the `#[diagnostic]` namespace and `#[diagnostic::on_unimplemented]` attribute](https://togithub.com/rust-lang/rust/pull/119888/)
-   [Make async-fn-in-trait implementable with concrete signatures](https://togithub.com/rust-lang/rust/pull/120103/)
-   [Make matching on NaN a hard error, and remove the rest of `illegal_floating_point_literal_pattern`](https://togithub.com/rust-lang/rust/pull/116284/)
-   [static mut: allow mutable reference to arbitrary types, not just slices and arrays](https://togithub.com/rust-lang/rust/pull/117614/)
-   [Extend `invalid_reference_casting` to include references casting to bigger memory layout](https://togithub.com/rust-lang/rust/pull/118983/)
-   [Add `non_contiguous_range_endpoints` lint for singleton gaps after exclusive ranges](https://togithub.com/rust-lang/rust/pull/118879/)
-   [Add `wasm_c_abi` lint for use of older wasm-bindgen versions](https://togithub.com/rust-lang/rust/pull/117918/)
    This lint currently only works when using Cargo.
-   [Update `indirect_structural_match` and `pointer_structural_match` lints to match RFC](https://togithub.com/rust-lang/rust/pull/120423/)
-   [Make non-`PartialEq`-typed consts as patterns a hard error](https://togithub.com/rust-lang/rust/pull/120805/)
-   [Split `refining_impl_trait` lint into `_reachable`, `_internal` variants](https://togithub.com/rust-lang/rust/pull/121720/)
-   [Remove unnecessary type inference when using associated types inside of higher ranked `where`-bounds](https://togithub.com/rust-lang/rust/pull/119849)
-   [Weaken eager detection of cyclic types during type inference](https://togithub.com/rust-lang/rust/pull/119989)
-   [`trait Trait: Auto {}`: allow upcasting from `dyn Trait` to `dyn Auto`](https://togithub.com/rust-lang/rust/pull/119338)

<a id="1.78.0-Compiler"></a>

## Compiler

-   [Made `INVALID_DOC_ATTRIBUTES` lint deny by default](https://togithub.com/rust-lang/rust/pull/111505/)
-   [Increase accuracy of redundant `use` checking](https://togithub.com/rust-lang/rust/pull/117772/)
-   [Suggest moving definition if non-found macro_rules! is defined later](https://togithub.com/rust-lang/rust/pull/121130/)
-   [Lower transmutes from int to pointer type as gep on null](https://togithub.com/rust-lang/rust/pull/121282/)

Target changes:

-   [Windows tier 1 targets now require at least Windows 10](https://togithub.com/rust-lang/rust/pull/115141/)
    -   [Enable CMPXCHG16B, SSE3, SAHF/LAHF and 128-bit Atomics in tier 1 Windows](https://togithub.com/rust-lang/rust/pull/120820/)
-   [Add `wasm32-wasip1` tier 2 (without host tools) target](https://togithub.com/rust-lang/rust/pull/120468/)
-   [Add `wasm32-wasip2` tier 3 target](https://togithub.com/rust-lang/rust/pull/119616/)
-   [Rename `wasm32-wasi-preview1-threads` to `wasm32-wasip1-threads`](https://togithub.com/rust-lang/rust/pull/122170/)
-   [Add `arm64ec-pc-windows-msvc` tier 3 target](https://togithub.com/rust-lang/rust/pull/119199/)
-   [Add `armv8r-none-eabihf` tier 3 target for the Cortex-R52](https://togithub.com/rust-lang/rust/pull/110482/)
-   [Add `loongarch64-unknown-linux-musl` tier 3 target](https://togithub.com/rust-lang/rust/pull/121832/)

Refer to Rust's \[platform support page]\[platform-support-doc]
for more information on Rust's tiered platform support.

<a id="1.78.0-Libraries"></a>

## Libraries

-   [Bump Unicode to version 15.1.0, regenerate tables](https://togithub.com/rust-lang/rust/pull/120777/)
-   [Make align_offset, align_to well-behaved in all cases](https://togithub.com/rust-lang/rust/pull/121201/)
-   [PartialEq, PartialOrd: document expectations for transitive chains](https://togithub.com/rust-lang/rust/pull/115386/)
-   [Optimize away poison guards when std is built with panic=abort](https://togithub.com/rust-lang/rust/pull/100603/)
-   [Replace pthread `RwLock` with custom implementation](https://togithub.com/rust-lang/rust/pull/110211/)
-   [Implement unwind safety for Condvar on all platforms](https://togithub.com/rust-lang/rust/pull/121768/)
-   [Add ASCII fast-path for `char::is_grapheme_extended`](https://togithub.com/rust-lang/rust/pull/121138/)

<a id="1.78.0-Stabilized-APIs"></a>

## Stabilized APIs

-   [`impl Read for &Stdin`](https://doc.rust-lang.org/stable/std/io/struct.Stdin.html#impl-Read-for-%26Stdin)
-   [Accept non `'static` lifetimes for several `std::error::Error` related implementations](https://togithub.com/rust-lang/rust/pull/113833/)
-   [Make `impl<Fd: AsFd>` impl take `?Sized`](https://togithub.com/rust-lang/rust/pull/114655/)
-   [`impl From<TryReserveError> for io::Error`](https://doc.rust-lang.org/stable/std/io/struct.Error.html#impl-From%3CTryReserveError%3E-for-Error)

These APIs are now stable in const contexts:

-   [`Barrier::new()`](https://doc.rust-lang.org/stable/std/sync/struct.Barrier.html#method.new)

<a id="1.78.0-Cargo"></a>

## Cargo

-   [Stabilize lockfile v4](https://togithub.com/rust-lang/cargo/pull/12852/)
-   [Respect `rust-version` when generating lockfile](https://togithub.com/rust-lang/cargo/pull/12861/)
-   [Control `--charset` via auto-detecting config value](https://togithub.com/rust-lang/cargo/pull/13337/)
-   [Support `target.<triple>.rustdocflags` officially](https://togithub.com/rust-lang/cargo/pull/13197/)
-   [Stabilize global cache data tracking](https://togithub.com/rust-lang/cargo/pull/13492/)

<a id="1.78.0-Misc"></a>

## Misc

-   [rustdoc: add `--test-builder-wrapper` arg to support wrappers such as RUSTC_WRAPPER when building doctests](https://togithub.com/rust-lang/rust/pull/114651/)

<a id="1.78.0-Compatibility-Notes"></a>

## Compatibility Notes

-   [Many unsafe precondition checks now run for user code with debug assertions enabled](https://togithub.com/rust-lang/rust/pull/120594/)
    This change helps users catch undefined behavior in their code, though the details of how much is checked are generally not stable.
-   [riscv only supports split_debuginfo=off for now](https://togithub.com/rust-lang/rust/pull/120518/)
-   [Consistently check bounds on hidden types of `impl Trait`](https://togithub.com/rust-lang/rust/pull/121679)
-   [Change equality of higher ranked types to not rely on subtyping](https://togithub.com/rust-lang/rust/pull/118247)
-   [When called, additionally check bounds on normalized function return type](https://togithub.com/rust-lang/rust/pull/118882)
-   [Expand coverage for `arithmetic_overflow` lint](https://togithub.com/rust-lang/rust/pull/119432/)
-   [Fix detection of potential interior mutability in `const` initializers](https://togithub.com/rust-lang/rust/issues/121250)
    This code was accidentally accepted. The fix can break generic code that borrows a value of unknown type,
    as there is currently no way to declare "this type has no interior mutability". In the future, stabilizing
    the [`Freeze` trait](https://togithub.com/rust-lang/rust/issues/121675) will allow proper support for such code.

<a id="1.78.0-Internal-Changes"></a>

## Internal Changes

These changes do not affect any public interfaces of Rust, but they represent
significant improvements to the performance or internals of rustc and related
tools.

-   [Update to LLVM 18](https://togithub.com/rust-lang/rust/pull/120055/)
-   [Build `rustc` with 1CGU on `x86_64-pc-windows-msvc`](https://togithub.com/rust-lang/rust/pull/112267/)
-   [Build `rustc` with 1CGU on `x86_64-apple-darwin`](https://togithub.com/rust-lang/rust/pull/112268/)
-   [Introduce `run-make` V2 infrastructure, a `run_make_support` library and port over 2 tests as example](https://togithub.com/rust-lang/rust/pull/113026/)
-   [Windows: Implement condvar, mutex and rwlock using futex](https://togithub.com/rust-lang/rust/pull/121956/)

</details>

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rust-toolchain.toml

@@ -1,3 +1,3 @@
 [toolchain]
-channel = "1.77.2"
+channel = "1.78.0"
 profile = "default"