[turbofan] Introduce proper JSCreateLiteralRegExp operator.

[turbofan] Introduce proper JSCreateLiteralRegExp operator.

This adds a new JavaScript level operator for regexp literal creation,
similar to what we already have for array and object literals. This
once gets lowered to a call to the FastCloneRegExpStub always.

R=mstarzinger@chromium.org

Committed: https://crrev.com/8659c5d1d287177369ce179a8d0b910192d840d9
Cr-Commit-Position: refs/heads/master@{#32288}

[Benedikt Meurer, 2015-11-25 14:16:33]

Hey Michi,

Here's the create literal regexp cleanup we talked about yesterday.
Please take a look.

Thanks,
Benedikt

[Michael Starzinger, 2015-11-25 14:49:15]

LGTM with suggestion.

https://codereview.chromium.org/1475973002/diff/1/src/compiler/js-generic-low...
File src/compiler/js-generic-lowering.cc (right):

https://codereview.chromium.org/1475973002/diff/1/src/compiler/js-generic-low...
src/compiler/js-generic-lowering.cc:531: Node* stub_code =
jsgraph()->HeapConstant(callable.code());
Is it possible to use JSGenericLowering::ReplaceWithStubCall here? If not that
it's fine as it is as well. I was just wondering.

[Michael Starzinger, 2015-11-25 14:52:56]

The CQ bit was checked by mstarzinger@chromium.org

[commit-bot: I haz the power, 2015-11-25 14:53:10]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1475973002/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1475973002/20001

[commit-bot: I haz the power, 2015-11-25 16:50:02]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-11-25 16:50:25]

Patchset 2 (id:??) landed as
https://crrev.com/8659c5d1d287177369ce179a8d0b910192d840d9
Cr-Commit-Position: refs/heads/master@{#32288}

[Igor Sheludko, 2015-11-25 18:15:23]

A revert of this CL (patchset #2 id:20001) has been created in
https://codereview.chromium.org/1472423002/ by ishell@chromium.org.

The reason for reverting is: Broke "V8 Linux64 GC Stress - custom snapshot".

http://build.chromium.org/p/client.v8/builders/V8%20Linux64%20GC%20Stress%20-....