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

[David Spickett via cfe-commits]

================
@@ -384,6 +384,10 @@ Modified Compiler Flags
   evaluating to ``true`` and an empty body such as ``while(1);``)
   are considered infinite, even when the ``-ffinite-loop`` flag is set.
 
+- Removed "arm interrupt calling convention" warning that was included in
----------------
DavidSpickett wrote:

I would rephrase this a bit:
```
The "arm interrupt calling convention" warning previously included in ``-Wextra`` has been removed and made into a unique warning enabled using ``-Warm-interrrupt-vfp-clobber``.
```

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