[llvm] [AArch64] Add verification for MemOp immediate ranges (PR #97561)

[David Green via llvm-commits]

davemgreen wrote:

I am trying to add a thing that adds padding into the stack frame to try and avoid hazards when running under SME. This was helping detect where the offsets go out of range. As pointed out in #97954 though, some of the existing values are a bit off. There is #98196 to fix up the existing uses (and I split some formatting off into d3cb277ea35d2cf25cdcc41b894959332477861c which helps with the order of the opcodes). I will rebase once that has gone in.

https://github.com/llvm/llvm-project/pull/97561