- Adds vmov, vswp instructions for QwNeonRegisters.
- Refactors existing vswp implementation, moves non-Neon adaption to
MacroAssembler.
- Adds simd128 support to CodeGenerator AssembleMove, AssembleSwap.

LOG=N
BUG=v8:4124

Review-Url: https://codereview.chromium.org/2523933002
Cr-Commit-Position: refs/heads/master@{#41291}