[llvm] [AArch64] Fold vector select with power-of-2 bit-test to CMTST+BSP (PR #209100)

[Mugundan S via llvm-commits]

MGN-GIT wrote:

Hi @davemgreen 
I have applied the requested changes, kindly take a look and let me know if there is anything has to be done

https://github.com/llvm/llvm-project/pull/209100