[WebAssembly] Finalize wasm_simd128.h intrinsics

Adds new intrinsics for instructions that are in the final SIMD spec but did not
previously have intrinsics. Also updates the names of existing intrinsics to
reflect the final names of the underlying instructions in the spec. Keeps the
old names as deprecated functions to ease the transition to the new names.

Differential Revision: https://reviews.llvm.org/D101112