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

[Chris Copeland via cfe-commits]

chrisnc wrote:

I'd like to also address #47815, but I wasn't able to find the right path to answer "is this M-profile" from `TargetInfo`. Would appreciate any suggestions on that. I think it may require `dynamic_cast`-ing the `TargetInfo` to an `ARMTargetInfo`, and then change one of the methods in there to be public...

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