VectorICs: megamorphic keyed loads in crankshaft don't need a vector.

VectorICs: megamorphic keyed loads in crankshaft don't need a vector.

They are content with a dummy vector, as MISSES won't result in
changing the real vector/slot at all.

BUG=

Committed: https://crrev.com/c8e4d57d3b3036a05902f5b916cb5d853a57393c
Cr-Commit-Position: refs/heads/master@{#27788}

[mvstanton, 2015-04-13 13:15:33]

mvstanton@chromium.org changed reviewers:
+ dcarney@chromium.org

[mvstanton, 2015-04-13 13:15:33]

Hi Dan, here is the CL we discussed.
Uploading ports...

[dcarney, 2015-04-13 13:19:38]

lgtm, assuming you always want MEGAMORPHIC in the keyed case

[mvstanton, 2015-04-13 13:48:19]

Thx! Yep, for now I do. Allowing learning to occur in other cases will mean
eliminating soft deopts here and there.

[mvstanton, 2015-04-13 13:48:54]

The CQ bit was checked by mvstanton@chromium.org

[commit-bot: I haz the power, 2015-04-13 13:49:08]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1067573003/40001

[commit-bot: I haz the power, 2015-04-13 13:50:37]

Committed patchset #3 (id:40001)

[commit-bot: I haz the power, 2015-04-13 13:50:45]

Patchset 3 (id:??) landed as
https://crrev.com/c8e4d57d3b3036a05902f5b916cb5d853a57393c
Cr-Commit-Position: refs/heads/master@{#27788}

[Michael Achenbach, 2015-04-13 16:18:57]

A revert of this CL (patchset #3 id:40001) has been created in
https://codereview.chromium.org/1060263003/ by machenbach@chromium.org.

The reason for reverting is: [Sheriff] Speculative revert for windows failure...
will reland if it doesn't help:
http://build.chromium.org/p/client.v8/builders/V8%20Win32%20-%20debug%20-%202....

[Michael Achenbach, 2015-04-13 17:46:53]

On 2015/04/13 16:18:57, Michael Achenbach wrote:
> A revert of this CL (patchset #3 id:40001) has been created in
> https://codereview.chromium.org/1060263003/ by mailto:machenbach@chromium.org.
> 
> The reason for reverting is: [Sheriff] Speculative revert for windows
failure...
> will reland if it doesn't help:
>
http://build.chromium.org/p/client.v8/builders/V8%20Win32%20-%20debug%20-%202....

Looks like the revert helped...

[mvstanton, 2015-04-13 18:09:13]

Yep, thanks for checking it out Michael, I'll have a look on Windows tomorrow...