[llvm] AtomicExpand: Fix creating invalid ptrmask for fat pointers (PR #94955)

[Jessica Clarke via llvm-commits]

jrtc27 wrote:

In fact, our original CHERI-MIPS was an example of exactly that. Our old 256-bit capability representation had the address in the middle of the representation, but this scheme would have lowered to it just fine.

https://github.com/llvm/llvm-project/pull/94955