[wasm] Implement first set of SIMD I8x16 ops

[wasm] Implement first set of SIMD I8x16 ops
 - 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}
Committed: https://chromium.googlesource.com/v8/v8/+/635eea88e58f264f7b2b3bfb32e0eca6ec2e8145

[gdeepti, 2017-04-18 22:10:50]

The CQ bit was checked by gdeepti@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2017-04-18 22:10:55]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2017-04-18 22:34:19]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2017-04-18 22:34:20]

Dry run: This issue passed the CQ dry run.

[bbudge, 2017-04-18 23:01:09]

lgtm

[Mircea Trofin, 2017-04-18 23:18:17]

On 2017/04/18 23:01:09, bbudge wrote:
> lgtm

rubberstamp lgtm

[gdeepti, 2017-04-18 23:21:29]

The CQ bit was checked by gdeepti@chromium.org

[commit-bot: I haz the power, 2017-04-18 23:21:34]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2017-04-18 23:23:12]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1492557689930460, "parent_rev":
"64c1286001b98656f7cf4a392a551a615346f2d8", "commit_rev":
"635eea88e58f264f7b2b3bfb32e0eca6ec2e8145"}

[commit-bot: I haz the power, 2017-04-18 23:23:19]

Description was changed from

==========
[wasm] Implement first set of SIMD I8x16 ops
 - 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
==========

to

==========
[wasm] Implement first set of SIMD I8x16 ops
 - 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}
Committed:
https://chromium.googlesource.com/v8/v8/+/635eea88e58f264f7b2b3bfb32e0eca6ec2...
==========

[commit-bot: I haz the power, 2017-04-18 23:23:19]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/v8/v8/+/635eea88e58f264f7b2b3bfb32e0eca6ec2...