[llvm] [MIR] Serialize MachineFrameInfo::isCalleeSavedInfoValid() (PR #90561)

[David Tellenbach via llvm-commits]

dtellenbach wrote:

Sure, the newly added test is failing because `llc` uses the x86 runner's target triple which doesn't know `$lr`. Moving to `MIR/AArch64` and requiring an arm64 triple.

https://github.com/llvm/llvm-project/pull/90561