[clang] [llvm] [WebAssembly] Implement prototype f32.load_f16 instruction. (PR #90906)

[Brendan Dahl via cfe-commits]

brendandahl wrote:

/cc @tlively @dschuff
(I guess I can't assign reviewers since I don't have commit access.) 

https://github.com/llvm/llvm-project/pull/90906