[llvm] [AArch64] Allow LDR merge with same destination register by renaming (PR #71908)

[Zhaoxuan Jiang via llvm-commits]

nocchijiang wrote:

Rebased, squashed all commits and addressed comments.

@davemgreen Since I don't have commit access yet, could you please merge the PR for me? Before pushing the update, I have tested the patch by compiling Chromium using the bootstrapped Clang, passing all the unit tests from Chromium on an Apple Silicon Mac.


https://github.com/llvm/llvm-project/pull/71908