[llvm] [RISCV] Add a pass to eliminate special copies in order to facilitate shrink-wrap optimization (PR #140716)

[Liao Chunyu via llvm-commits]

ChunyuLiao wrote:

The patch was updated to incorporate feedback from earlier reviews. However, based on the discussion above and the fact that the optimization showed little benefit for spec cpu 473, close the patch. Many thanks to everyone for the support and feedback.


https://github.com/llvm/llvm-project/pull/140716