https://github.com/efriedma-quic commented:

>From an ABI perspective, this seems fine: if you want fp to always be valid, 
>sure, lets enforce that.

Do we generate appropriate diagnostics for inline asm?

Does the AArch64 backend actually support this flag?  I briefly tried, and it 
looks like this doesn't actually do anything.  I think we only implemented 
support for 32-bit Arm.

Should we make some corresponding change to LLVM so frontends that don't 
explicitly request some specific frame-pointer behavior follow the ABI by 
default?

https://github.com/llvm/llvm-project/pull/146582
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