[clang] [Clang][ARM][AArch64] Alway emit protection attributes for functions. (PR #82819)

[via cfe-commits]

DanielKristofKiss wrote:

Function attributes are only attached when they are set.
#83153 ensures the synthetic function are also gets the right attributes so 
the backend doesn't need to use the module attributes #83154. 

https://github.com/llvm/llvm-project/pull/82819