[clang] [ARM] arm_acle.h add Coprocessor Instrinsics (PR #75440)

[David Green via cfe-commits]

davemgreen wrote:

Thanks for doing this.
I think that __ARM_FEATURE_COPROC should be a bitfield, as defined in https://arm-software.github.io/acle/main/acle.html#coprocessor-intrinsics. That would remove the need for the other macros.

https://github.com/llvm/llvm-project/pull/75440