[llvm] [WIP][BOLT][AArch64] Optimize the mov-imm-to-reg operation (PR #189304)

[Maksim Panchenko via llvm-commits]

maksfb wrote:

Hi @chenshanzhi, thanks for the PR. Have you seen https://github.com/llvm/llvm-project/pull/137413? It was close to completion but there were test failures. 

https://github.com/llvm/llvm-project/pull/189304