[clang] [clang][ARM] Fix warning for using VFP from interrupts. (PR #91870)

[Alan Phipps via cfe-commits]

evodius96 wrote:

Somewhat related to this -- we (TI) are presently in the process of upstreaming our mod to save/restore VFP registers with the interrupt_save_fp attribute. See #89654.  I think the patch needs to be updated in light of upstream changes to the Arm frame lowering code.

https://github.com/llvm/llvm-project/pull/91870