[clang] [llvm] [AArch64] Remove aarch64_neon_vcvtfp2hf and aarch64_neon_vcvthf2fp (PR #203903)

[Eli Friedman via cfe-commits]

https://github.com/efriedma-quic commented:

Do we need to do anything for strictfp?

https://github.com/llvm/llvm-project/pull/203903