[clang] [llvm] [ARM] Armv8-R does not require fp64 or neon. (PR #88287)

[via llvm-commits]

moridinga wrote:

> Another option is to include `FeatureFPARMv8_D16_SP` in `ARMv8r`. The R-profile supplement of the Arm manual does say that this is a minimum feature requirement (as opposed to just being a variant of the R52).

D16_SP is guaranteed to be supported as minimum FP feature on anything implementing the ARMv8r arch, so this would make sense.

https://github.com/llvm/llvm-project/pull/88287