[clang] [clang][Driver][RISCV] Honor -m[no-]global-merge for RISC-V (PR #79372)

[Jonathon Penix via cfe-commits]

jonathonpenix wrote:

Also few misc. notes:

1. Please let me know if this needs to be discussed elsewhere and I'd be happy to do so! I was originally thinking to ping https://reviews.llvm.org/D130481 / https://reviews.llvm.org/D129178 to check if this made sense, but they are read-only now IIUC.
2. I'm also not certain if there were other concerns about making GlobalMerge more easily accessible to users beyond what was mentioned in https://reviews.llvm.org/D129178 (if there are correctness concerns, etc. that I missed). My reading of the regressions mentioned was that they were code size/performance related (rather than correctness) but I might be misunderstanding/have missed something.

Thanks!

https://github.com/llvm/llvm-project/pull/79372