[turbofan] Context specialize during inlining.

[turbofan] Context specialize during inlining.

Context specialization enables inlining (at least currently it is the
only enabler for inlining), but inlining enables more possibilities for
context specialization. So we really need to run them together.

This is especially important with the "module based builtins" that we're
working towards.

BUG=v8:3952
LOG=n

Committed: https://crrev.com/a556a104c0f2c3d9dc00c37ff3d6d93db5287354
Cr-Commit-Position: refs/heads/master@{#27085}

[Benedikt Meurer, 2015-03-09 18:40:32]

bmeurer@chromium.org changed reviewers:
+ jarin@chromium.org, yangguo@chromium.org

[Benedikt Meurer, 2015-03-09 18:40:32]

Yang: This is the change I was talking about to make your context based builtins
work nicely with TurboFan inlining. Basically, you cannot run context
specialization w/o inlining or vice versa. Both need to run at the same time
(which is now possible since both are regular reducers, yeah)!
Jaro: Please also take a look.

[Benedikt Meurer, 2015-03-10 08:09:29]

bmeurer@chromium.org changed reviewers:
+ titzer@chromium.org
- jarin@chromium.org, yangguo@chromium.org

[Benedikt Meurer, 2015-03-10 08:10:15]

Ben: This uses the approach you suggested, and is actually easier long-term.
PTAL

[titzer, 2015-03-10 08:16:21]

https://codereview.chromium.org/988423004/diff/40001/src/compiler/js-inlining.cc
File src/compiler/js-inlining.cc (right):

https://codereview.chromium.org/988423004/diff/40001/src/compiler/js-inlining...
src/compiler/js-inlining.cc:350: graph_builder.CreateGraph(true, false);
Can we context specialization a flag to the inliner?

That way we can do both, and there are actually fewer changes to this code.

[titzer, 2015-03-10 08:26:08]

Sigh LGTM

[Benedikt Meurer, 2015-03-10 08:28:36]

The CQ bit was checked by bmeurer@chromium.org

[commit-bot: I haz the power, 2015-03-10 08:29:10]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/988423004/40001

[commit-bot: I haz the power, 2015-03-10 08:37:21]

Committed patchset #3 (id:40001)

[commit-bot: I haz the power, 2015-03-10 08:37:32]

Patchset 3 (id:??) landed as
https://crrev.com/a556a104c0f2c3d9dc00c37ff3d6d93db5287354
Cr-Commit-Position: refs/heads/master@{#27085}