* HOTFIX damlc: allow for passing options to the underlying GHC
As `damlc` is based on GHC, it "understands" all options that GHC understands.
This PR introduces a way to use GHC options that are not exposed by the `damlc`
driver, by passing any number of `--ghc-option CUSTOM_OPTION` on the command line.
The code uses the GHC function which parses options inside files, so
prohibiting a few options that we would not want to expose (package db, output
file, etc).
All warnings that GHC emits during flag processing are presented to the user.
If an option contradicts a DAML compiler setting, the compilation will be
aborted with a GHC exception (calls makeDynFlagsConsistent internally).
* HOTFIX damlc: small clean-up
* Remove all traces of the long gone value restriction
We remove the value check since it has only been used by one `damli` command.
We also remove the constant folding from the DAML-LF simplifier. It is more
likely to diverge from the semantics of the interpreter than to do any good.
* Make hlint happy
This was used by the old DAML-LF based record constructor/projection
inliner. We'bve recently replaced by an inlining mechanism which is part
of the conversion from GHC Core to DAML-LF.
