[turbofan] Remove IfExceptionHint from exception projections.

[turbofan] Remove IfExceptionHint from exception projections.

This completely removes translation of exception handler predictions
from the graph IR. We now rely on the runtime using deoptimization
infomation via {FrameSummary} for predictions in optimized code.

R=bmeurer@chromium.org

Committed: https://crrev.com/a4743baec153d6748dbdada4484f3fdd369ba7f2
Cr-Commit-Position: refs/heads/master@{#38250}

[Michael Starzinger, 2016-08-02 11:37:17]

mstarzinger@chromium.org changed reviewers:
+ yangguo@chromium.org

[Michael Starzinger, 2016-08-02 11:37:18]

Benedikt: PTAL.
Yang: FYI.

[Benedikt Meurer, 2016-08-02 11:40:30]

Awesome. LGTM. Ship it!

[Yang, 2016-08-02 13:20:40]

https://codereview.chromium.org/2207533002/diff/1/src/compiler/code-generator.cc
File src/compiler/code-generator.cc (right):

https://codereview.chromium.org/2207533002/diff/1/src/compiler/code-generator...
src/compiler/code-generator.cc:234: table->SetReturnHandler(static_cast<int>(i),
position, prediction);
Do we still want to have this prediction field when we create the handler table
for turbofan?

[Michael Starzinger, 2016-08-02 13:22:49]

https://codereview.chromium.org/2207533002/diff/1/src/compiler/code-generator.cc
File src/compiler/code-generator.cc (right):

https://codereview.chromium.org/2207533002/diff/1/src/compiler/code-generator...
src/compiler/code-generator.cc:234: table->SetReturnHandler(static_cast<int>(i),
position, prediction);
On 2016/08/02 13:20:40, Yang wrote:
> Do we still want to have this prediction field when we create the handler
table
> for turbofan?

Acknowledged. I agree, we should remove the prediction from the return-address
based handler table API. I wanted to do that in a follow-up CL in order to keep
this one a compiler-only change.

[Yang, 2016-08-02 13:26:53]

On 2016/08/02 13:22:49, Michael Starzinger wrote:
>
https://codereview.chromium.org/2207533002/diff/1/src/compiler/code-generator.cc
> File src/compiler/code-generator.cc (right):
> 
>
https://codereview.chromium.org/2207533002/diff/1/src/compiler/code-generator...
> src/compiler/code-generator.cc:234:
table->SetReturnHandler(static_cast<int>(i),
> position, prediction);
> On 2016/08/02 13:20:40, Yang wrote:
> > Do we still want to have this prediction field when we create the handler
> table
> > for turbofan?
> 
> Acknowledged. I agree, we should remove the prediction from the return-address
> based handler table API. I wanted to do that in a follow-up CL in order to
keep
> this one a compiler-only change.

LGTM

[Michael Starzinger, 2016-08-02 14:21:36]

The CQ bit was checked by mstarzinger@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2016-08-02 14:21:38]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-08-02 14:42:21]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2016-08-02 14:42:22]

Dry run: This issue passed the CQ dry run.

[Michael Starzinger, 2016-08-02 14:46:36]

The CQ bit was checked by mstarzinger@chromium.org

[Michael Starzinger, 2016-08-02 14:46:37]

The patchset sent to the CQ was uploaded after l-g-t-m from
bmeurer@chromium.org, yangguo@chromium.org
Link to the patchset: https://codereview.chromium.org/2207533002/#ps20001
(title: "Rebased.")

[commit-bot: I haz the power, 2016-08-02 14:46:43]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-08-02 14:48:25]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2016-08-02 14:49:18]

Description was changed from

==========
[turbofan] Remove IfExceptionHint from exception projections.

This completely removes translation of exception handler predictions
from the graph IR. We now rely on the runtime using deoptimization
infomation via {FrameSummary} for predictions in optimized code.

R=bmeurer@chromium.org
==========

to

==========
[turbofan] Remove IfExceptionHint from exception projections.

This completely removes translation of exception handler predictions
from the graph IR. We now rely on the runtime using deoptimization
infomation via {FrameSummary} for predictions in optimized code.

R=bmeurer@chromium.org

Committed: https://crrev.com/a4743baec153d6748dbdada4484f3fdd369ba7f2
Cr-Commit-Position: refs/heads/master@{#38250}
==========

[commit-bot: I haz the power, 2016-08-02 14:49:19]

Patchset 2 (id:??) landed as
https://crrev.com/a4743baec153d6748dbdada4484f3fdd369ba7f2
Cr-Commit-Position: refs/heads/master@{#38250}