[clang] [llvm] [AArch64] Stack probing for function prologues (PR #66524)

[Momchil Velikov via cfe-commits]

momchil-velikov wrote:

In the last update:
 - do not set the `FrameSetup` flag for dynamic allocations
 - avoid back to back probing loops for allocation of SVE locals and non-SVE locals - fold the allocations together and emit a single loop (or no loop)

https://github.com/llvm/llvm-project/pull/66524