Add SIMD 128 alignment support to Heap.

Add SIMD 128 alignment support to Heap.
Adds SIMD 128 alignment sizes and masks.
Adds support in Heap for SIMD alignments and fills.
Reworks cctest so that each test independently aligns its allocation address, rather than depending on the previous tests ending state. Adds test cases for SIMD.

LOG=N
BUG=v8:4124
Committed: https://crrev.com/4347d56a6919ae06a70e4a4a8b2f1179cf47bc7e
Cr-Commit-Position: refs/heads/master@{#28767}

Committed: https://crrev.com/a18a94ef364b66dd9329db0d32c415503cfa3616
Cr-Commit-Position: refs/heads/master@{#28771}

[bbudge, 2015-05-29 22:09:31]

bbudge@chromium.org changed reviewers:
+ hpayer@chromium.org

[bbudge, 2015-06-02 12:02:35]

ping

[jochen (gone - plz use gerrit), 2015-06-02 18:30:01]

jochen@chromium.org changed reviewers:
+ jochen@chromium.org

[jochen (gone - plz use gerrit), 2015-06-02 18:30:02]

lgtm

[Hannes Payer (out of office), 2015-06-02 18:41:56]

On 2015/06/02 18:30:02, jochen wrote:
> lgtm

Lgtm

[bbudge, 2015-06-02 19:22:59]

The CQ bit was checked by bbudge@chromium.org

[commit-bot: I haz the power, 2015-06-02 19:23:27]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1159453004/40001

[bbudge, 2015-06-02 19:49:13]

The CQ bit was unchecked by bbudge@chromium.org

[bbudge, 2015-06-02 20:38:10]

The CQ bit was checked by bbudge@chromium.org

[commit-bot: I haz the power, 2015-06-02 20:38:29]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1159453004/40001

[commit-bot: I haz the power, 2015-06-02 20:40:21]

Committed patchset #3 (id:40001)

[bbudge, 2015-06-02 21:08:07]

A revert of this CL (patchset #3 id:40001) has been created in
https://codereview.chromium.org/1169453003/ by bbudge@chromium.org.

The reason for reverting is: Breaks Linux - arm64 - sim - MSAN 
TBR=jochen.

[commit-bot: I haz the power, 2015-06-02 21:15:58]

Patchset 3 (id:??) landed as
https://crrev.com/4347d56a6919ae06a70e4a4a8b2f1179cf47bc7e
Cr-Commit-Position: refs/heads/master@{#28767}

[bbudge, 2015-06-02 22:22:36]

MSAN was marking the whole allocation as uninitialized, which caused the filler
objects to trigger failures. The last patchset modifies the amount of memory
that is marked in case filler was created.

[bbudge, 2015-06-02 22:38:49]

On 2015/06/02 22:22:36, bbudge wrote:
> MSAN was marking the whole allocation as uninitialized, which caused the
filler
> objects to trigger failures. The last patchset modifies the amount of memory
> that is marked in case filler was created.

Change is in spaces-inl.h:
https://codereview.chromium.org/1159453004/diff2/40001:60001/src/heap/spaces-...

[bbudge, 2015-06-02 22:40:11]

The CQ bit was checked by bbudge@chromium.org

[bbudge, 2015-06-02 22:40:12]

The patchset sent to the CQ was uploaded after l-g-t-m from hpayer@chromium.org,
jochen@chromium.org
Link to the patchset: https://codereview.chromium.org/1159453004/#ps60001
(title: "Only mark aligned object memory as MSAN uninitialized.")

[commit-bot: I haz the power, 2015-06-02 22:40:45]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1159453004/60001

[commit-bot: I haz the power, 2015-06-02 22:56:09]

Committed patchset #4 (id:60001)

[commit-bot: I haz the power, 2015-06-02 22:56:22]

Patchset 4 (id:??) landed as
https://crrev.com/a18a94ef364b66dd9329db0d32c415503cfa3616
Cr-Commit-Position: refs/heads/master@{#28771}