[llvm] [ARM] Fix CMSE S->NS calls when CONTROL_S.SFPA==0 (CVE-2024-7883) (PR #114433)

[Eli Friedman via llvm-commits]

efriedma-quic wrote:

I was thinking of a case where you had a undef floating-point argument, we skip this code, but there isn't any code to actually set the FP argument.

https://github.com/llvm/llvm-project/pull/114433