chore(ci): Remove unused concurrency tests (#8100)

.github/workflows/CI.yml

@@ -651,19 +651,9 @@ jobs:
       - name: Run cargo test (concurrent)
         if: runner.os == 'Linux' && matrix.settings.crate != 'swc_ecma_minifier'
         shell: bash
-        env:
-          SWC_FORCE_CONCURRENT: "1"
         run: |
           ./scripts/github/test-concurrent.sh ${{ matrix.settings.crate }}
 
-      - name: Run cargo test (swc, concurrent)
-        shell: bash
-        if: matrix.settings.crate == 'swc' && runner.os == 'Linux'
-        env:
-          SWC_FORCE_CONCURRENT: "1"
-        run: |
-          cargo test -p swc --features concurrent
-
       - name: Install cargo-hack
         uses: baptiste0928/cargo-install@v2
         if: matrix.settings.os == 'ubuntu-latest'

Cargo.toml

@@ -36,10 +36,9 @@ resolver = "2"
 debug = true
 # lto = true
 
-# Without this, printing diff consumes more than a minute.
-
-[profile.dev.package.pretty_assertions]
+# Optimize for iteration
+[profile.dev.build-override]
 opt-level = 3
 
-[profile.test.package.pretty_assertions]
+[profile.dev.package."*"]
 opt-level = 3

crates/swc_ecma_transforms_base/src/perf.rs

@@ -49,7 +49,7 @@ where
     where
         N: Send + Sync + VisitWith<Self>,
     {
-        if nodes.len() >= threshold || option_env!("SWC_FORCE_CONCURRENT") == Some("1") {
+        if nodes.len() >= threshold {
             GLOBALS.with(|globals| {
                 HELPERS.with(|helpers| {
                     HANDLER.with(|handler| {
@@ -107,7 +107,7 @@ where
     where
         N: Send + Sync + VisitMutWith<Self>,
     {
-        if nodes.len() >= threshold || option_env!("SWC_FORCE_CONCURRENT") == Some("1") {
+        if nodes.len() >= threshold {
             GLOBALS.with(|globals| {
                 HELPERS.with(|helpers| {
                     HANDLER.with(|handler| {
@@ -165,7 +165,7 @@ where
     where
         N: Send + Sync + FoldWith<Self>,
     {
-        if nodes.len() >= threshold || option_env!("SWC_FORCE_CONCURRENT") == Some("1") {
+        if nodes.len() >= threshold {
             use rayon::prelude::*;
 
             let (visitor, nodes) = GLOBALS.with(|globals| {

crates/swc_ecma_utils/src/parallel.rs

@@ -134,7 +134,7 @@ where
         I: Items,
         F: Send + Sync + Fn(&mut Self, usize, I::Elem),
     {
-        if nodes.len() >= threshold || option_env!("SWC_FORCE_CONCURRENT") == Some("1") {
+        if nodes.len() >= threshold {
             GLOBALS.with(|globals| {
                 use rayon::prelude::*;