[wasm] Add native x64 implementations for I32x4Splat, I32x4ExtractLane
- Instruction selection, code generation, test for Splat/Extract - Fixes for AstS128 Locals in wasm R=bbudge@chromium.org, titzer@chromium.org Review-Url: https://codereview.chromium.org/2264533002 Cr-Commit-Position: refs/heads/master@{#38843}
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