[turbofan] Introduce JSCallReducer to strength reduce JSCallFunction nodes.

[turbofan] Introduce JSCallReducer to strength reduce JSCallFunction nodes.

The JSCallReducer runs together with inlining and tries to strength
reduce JSCallFunction nodes; currently it can fold
Function.prototype.call and Function.prototype.apply (with arguments),
and make it possible to inline across them.

In the case of Function.prototype.apply with arguments we still have to
leave the JSCreateArguments node in the graph because there might be
other (frame state) uses. Once escape analysis is ready, it will take
care of removing these nodes and adding appropriate transitions for the
deoptimizer.

R=jarin@chromium.org
BUG=v8:4551
LOG=n

Committed: https://crrev.com/55c07a8b2f9c88f4429cd22100d520a5cf24c567
Cr-Commit-Position: refs/heads/master@{#31979}

[Benedikt Meurer, 2015-11-13 10:30:56]

Hey Jaro,

Here's the initial implementation of the idea I told you about before. It does
only the limited apply with arguments case.
Please take a look.

Thanks,
Benedikt

[Jarin, 2015-11-13 10:56:56]

lgtm, but I am wondering whether we should test this.

https://codereview.chromium.org/1445513002/diff/1/src/compiler/js-call-reducer.h
File src/compiler/js-call-reducer.h (right):

https://codereview.chromium.org/1445513002/diff/1/src/compiler/js-call-reduce...
src/compiler/js-call-reducer.h:20: // inlining or other optimizations to perform
further optimizations afterwards.
allow -> enable
"to perform further optimizations afterwards" -> "to be performed afterwards"

[Benedikt Meurer, 2015-11-13 11:32:42]

https://codereview.chromium.org/1445513002/diff/1/src/compiler/js-call-reducer.h
File src/compiler/js-call-reducer.h (right):

https://codereview.chromium.org/1445513002/diff/1/src/compiler/js-call-reduce...
src/compiler/js-call-reducer.h:20: // inlining or other optimizations to perform
further optimizations afterwards.
On 2015/11/13 10:56:56, Jarin wrote:
> allow -> enable
> "to perform further optimizations afterwards" -> "to be performed afterwards"

Done.

[Benedikt Meurer, 2015-11-13 11:33:40]

The CQ bit was checked by bmeurer@chromium.org

[Benedikt Meurer, 2015-11-13 11:33:41]

The patchset sent to the CQ was uploaded after l-g-t-m from jarin@chromium.org
Link to the patchset: https://codereview.chromium.org/1445513002/#ps40001
(title: "Comment.")

[commit-bot: I haz the power, 2015-11-13 11:33:51]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1445513002/40001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1445513002/40001

[commit-bot: I haz the power, 2015-11-13 12:19:41]

Committed patchset #3 (id:40001)

[commit-bot: I haz the power, 2015-11-14 23:21:22]

Patchset 3 (id:??) landed as
https://crrev.com/55c07a8b2f9c88f4429cd22100d520a5cf24c567
Cr-Commit-Position: refs/heads/master@{#31979}