- Add Simd128 type to Wasm AST types
  - Seperate out generic SIMD Machine ops
  - Opcodes added as per Wasm SIMD opcode table prototype. All opcodes
  except Bool8x16, Bool16x8 and S128 Load/Store opcodes added.

Review-Url: https://codereview.chromium.org/2009553002
Cr-Commit-Position: refs/heads/master@{#36506}