MaskRay added a comment. In case my previous comment is not clear: we can do renaming in LLVM, but the benefit is small (for a few libcalls (only some really simple libcalls) with custom code emitting, if they have `asm(...)`, they are now optimizable). We will require a renaming infrastructure in LLVM IR, which is a large undertaking. The patch as is is the most practical approach.
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