*-ld.lld linker not recognized as "lld"

[androm3da]

clang provides hexagon-link specific link arguments such as -mcpu=hexagonv65 and -march=hexagon when hexagon-unknown-linux-musl-ld.lld is found. lld rejects this with the following error:

hexagon-unknown-linux-musl-ld.lld: error: unknown emulation: cpu=hexagonv65

clang should instead handle this as it does for the case when ld.lld is found in the PATH when hexagon-unknown-linux-musl-clang -fuse-ld=lld ... is invoked.

[llvmbot]

@llvm/issue-subscribers-backend-hexagon

Author: Brian Cain (androm3da)

clang provides `hexagon-link` specific link arguments such as `-mcpu=hexagonv65` and `-march=hexagon` when `hexagon-unknown-linux-musl-ld.lld` is found. lld rejects this with the following error:

hexagon-unknown-linux-musl-ld.lld: error: unknown emulation: cpu=hexagonv65

clang should instead handle this as it does for the case when ld.lld is found in the PATH when hexagon-unknown-linux-musl-clang -fuse-ld=lld ... is invoked.

[llvmbot]

@llvm/issue-subscribers-clang-driver

Author: Brian Cain (androm3da)

clang provides `hexagon-link` specific link arguments such as `-mcpu=hexagonv65` and `-march=hexagon` when `hexagon-unknown-linux-musl-ld.lld` is found. lld rejects this with the following error:

hexagon-unknown-linux-musl-ld.lld: error: unknown emulation: cpu=hexagonv65

clang should instead handle this as it does for the case when ld.lld is found in the PATH when hexagon-unknown-linux-musl-clang -fuse-ld=lld ... is invoked.

[androm3da]

This should be fixed by #117338

[androm3da]

/cherry-pick 2dc0de7