[clang] [llvm] [WebAssembly] Add intrinsics to wasm_simd128.h for all FP16 instructions (PR #106465)

[Heejin Ahn via cfe-commits]

aheejin wrote:

Looks good to me, but I'm not an expert here.. Maybe @tlively can take a look?

https://github.com/llvm/llvm-project/pull/106465