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

[via llvm-commits]

weiguozhi wrote:

@mahesh-attarde the problem is even without the patch https://github.com/llvm/llvm-project/pull/81048, https://godbolt.org/z/s16MxPME3 still generates wrong code. Could you paste your code here?

@rnk compile time error sounds reasonable for these difficult cases.

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