[llvm] Spill/restore FP/BP around instructions in which they are clobbered (PR #81048)

[via llvm-commits]

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+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 4
+; RUN: llc -mtriple=x86_64-pc-linux -stackrealign -spill-clobbered-fp=true -verify-machineinstrs < %s | FileCheck %s
+
+; Calling convention ghccc uses ebp to pass parameter, so calling a function
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zmodem wrote:

Should we also have a test which covers the case when both the frame and base pointer need to be spilled/restored?

https://github.com/llvm/llvm-project/pull/81048