Implement a wrapper script to translate the `opt(1)` arguments passed
by the GHC 9.0.2 binary distribution to the equivalent arguments
for the new LLVM pass manager passed by GHC ≥ 9.10 and our
soon‐to‐be‐patched compilers. This ensures that the bootstrap
of GHC 9.4 continues to work on AArch64.
On an earlier version of this change, I built `haskell.compiler.ghc948`
on both `aarch64-linux` and `aarch64-darwin`, and
`haskell.compiler.ghc924` on `aarch64-linux` only (it is already
broken on Darwin). I confirmed that we get functionally identical
store outputs before and after this change, modulo self‐references:
$ cp -a result-before/ before
$ cp -a result-after/ after
$ chmod -R +w before after
$ LANG=C find before -type f -exec \
remove-references-to \
-t $(readlink result-before) \
-t $(readlink result-before-doc) \
'{}' ';'
$ LANG=C find after -type f -exec \
remove-references-to \
-t $(readlink result-after) \
-t $(readlink result-after-doc) \
'{}' ';'
# Darwin only: normalize build user UIDs in the archive files…
$ LANG=C find before -name '*.a' -exec \
sed -i 's/ 360 / 351 /g' '{}' ';'
$ diff -r before after
# Linux only: the `package.cache` files differ, presumably due to
# an unrelated reproducibility issue.
Therefore, bumping this LLVM dependency did not affect the end result
of the bootstrap for the only compilers it is used for.
