[llvm] [Codegen] Spill/Restore FP/BP under option (PR #114791)

[via llvm-commits]

mahesh-attarde wrote:

> If there's an open bug report reporting some specific code pattern breaks, we can discuss on that bug report whether it makes sense to temporarily revert the change.
> 
> It doesn't make sense to permanently disable the code. Which is essentially what you're proposing, because you haven't given enough information to fix the issue.

Short story on Bug, For code
$rsp = 0x7fffc27fadc0 and `vmovdqa64 %zmm19, 0x90(%rsp)` results in  SEGFAULT(#GP). I have number of cases with same pattern. Same Example expectation with `vmovdqa64 %zmm19, 0x80(%rsp)`


https://github.com/llvm/llvm-project/pull/114791