[patch] Don't rauw an alias in llvm.used (v2)

[Rafael Espíndola]

Thanks a lot for the review. A new patch is attached. I have moved
into LLVMUsed only the functionally that I think might be used by
other passes, so I have left the checks/patching to make sure that
llvm.compiler_used and llvm.used are disjoint out of it.

Cheers,
Rafael
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