- I8x16Splat, I8x16ExtractLane, I8x16ReplaceLane
 - Binops: I8x16Add, I8x16AddSaturateS, I8x16Sub, I8x16SubSaturateS, I8x16MinS,
 I8x16MaxS, I8x16AddSaturateU, I8x16SubSaturateU, I8x16MinU, I8x16MaxU
 - Compare ops: I8x16Eq, I8x16Ne

BUG=v8:6020

R=bbudge@chromium.org, bmeurer@chromium.org

Review-Url: https://codereview.chromium.org/2829483002
Cr-Commit-Position: refs/heads/master@{#44706}