Reland of Add web compat workarounds for ES2015 RegExp semantics (patchset #3 id:40001 of https://c…

Reland of Add web compat workarounds for ES2015 RegExp semantics (patchset #3 id:40001 of https://codereview.chromium.org/1543723002/ )

Unexpectedly, websites depend on doing feature testing with
RegExp.prototype.sticky and browser testing with RegExp.prototype.toString().
ES2015 newly throws exceptions for both of these. In order to enable shipping
new ES2015 semantics, this patch puts in narrow workarounds for those two
cases, keeping their old behavior. UseCounters are added for how often
those particular cases come up, so we can see if it can be deprecated.

This reland replaces problematic legacy const usage with var, to
avoid issues with nosnap builds.

R=yangguo
CC=bmeurer
BUG=v8:4637, v8:4617
LOG=Y
CQ_INCLUDE_TRYBOTS=tryserver.chromium.linux:linux_chromium_rel_ng;tryserver.blink:linux_blink_rel

Committed: https://crrev.com/424ef009a5d394ca212de8b8c91b963e424f7e72
Cr-Commit-Position: refs/heads/master@{#33002}

[Dan Ehrenberg, 2015-12-22 08:03:11]

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

[commit-bot: I haz the power, 2015-12-22 08:03:22]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1545633002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1545633002/1

[commit-bot: I haz the power, 2015-12-22 08:06:21]

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

[commit-bot: I haz the power, 2015-12-22 08:06:22]

Dry run: Try jobs failed on following builders:
  v8_linux_arm64_rel on tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_linux_arm64_rel/builds/1...)
  v8_linux_arm_rel on tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_linux_arm_rel/builds/11779)

[Dan Ehrenberg, 2015-12-22 08:20:15]

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

[commit-bot: I haz the power, 2015-12-22 08:20:24]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1545633002/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1545633002/20001

[Yang, 2015-12-22 08:22:15]

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

[Yang, 2015-12-22 08:22:16]

lgtm

[Dan Ehrenberg, 2015-12-22 08:37:10]

The CQ bit was unchecked by littledan@chromium.org

[Dan Ehrenberg, 2015-12-22 08:37:13]

The CQ bit was checked by littledan@chromium.org

[commit-bot: I haz the power, 2015-12-22 08:37:18]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1545633002/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1545633002/20001

[commit-bot: I haz the power, 2015-12-22 09:16:33]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-12-22 09:17:01]

Description was changed from

==========
Reland of Add web compat workarounds for ES2015 RegExp semantics (patchset #3
id:40001 of https://codereview.chromium.org/1543723002/ )

Unexpectedly, websites depend on doing feature testing with
RegExp.prototype.sticky and browser testing with RegExp.prototype.toString().
ES2015 newly throws exceptions for both of these. In order to enable shipping
new ES2015 semantics, this patch puts in narrow workarounds for those two
cases, keeping their old behavior. UseCounters are added for how often
those particular cases come up, so we can see if it can be deprecated.

This reland replaces problematic legacy const usage with var, to
avoid issues with nosnap builds.

R=yangguo
CC=bmeurer
BUG=v8:4637,v8:4617
LOG=Y
CQ_INCLUDE_TRYBOTS=tryserver.chromium.linux:linux_chromium_rel_ng;tryserver.blink:linux_blink_rel
==========

to

==========
Reland of Add web compat workarounds for ES2015 RegExp semantics (patchset #3
id:40001 of https://codereview.chromium.org/1543723002/ )

Unexpectedly, websites depend on doing feature testing with
RegExp.prototype.sticky and browser testing with RegExp.prototype.toString().
ES2015 newly throws exceptions for both of these. In order to enable shipping
new ES2015 semantics, this patch puts in narrow workarounds for those two
cases, keeping their old behavior. UseCounters are added for how often
those particular cases come up, so we can see if it can be deprecated.

This reland replaces problematic legacy const usage with var, to
avoid issues with nosnap builds.

R=yangguo
CC=bmeurer
BUG=v8:4637,v8:4617
LOG=Y
CQ_INCLUDE_TRYBOTS=tryserver.chromium.linux:linux_chromium_rel_ng;tryserver.blink:linux_blink_rel

Committed: https://crrev.com/424ef009a5d394ca212de8b8c91b963e424f7e72
Cr-Commit-Position: refs/heads/master@{#33002}
==========

[commit-bot: I haz the power, 2015-12-22 09:17:02]

Patchset 2 (id:??) landed as
https://crrev.com/424ef009a5d394ca212de8b8c91b963e424f7e72
Cr-Commit-Position: refs/heads/master@{#33002}