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

[Mugundan S via llvm-commits]

MGN-GIT wrote:

> Thanks - this is looking good. Can you update the remaining test cases too?

Yeah sure, I am currently looking into the test cases, will update them shortly 

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