[llvm] [InstCombine][AArch64] Combine ANDs with two constant CMPHS (PR #213995)

[Matthew Devereau via llvm-commits]

MDevereau wrote:

This keeps failing with 

S6 = COPY D3 ... unimplemented reg-to-reg copy

on the Linux AArch64 build with libcxx tests, though I don't think it's this patch's fault.

https://github.com/llvm/llvm-project/pull/213995