[libclc] Split off library build system into helpers #15914
Merged
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This splits off several key parts of the build system into utility methods. This will be used in upcoming patches to help provide additional sets of target-specific builtin libraries.
Running llvm-diff on the resulting LLVM bytecode binaries, and regular diff on SPIR-V binaries, shows no differences before and after this patch.
This is a cherry-pick of upstream commit 183b38e. The conflicts weren't trivial so I thought I'd resolve them myself and not wait for a pulldown. CC @jsji