haskell.compiler.ghc902Binary: bump LLVM by wrapping `opt(1)`

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.

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