Add new semantics + compat fallback to Intl constructor

Add new semantics + compat fallback to Intl constructor

ECMA 402 v2 made Intl constructors more strict in terms of how they would
initialize objects, refusing to initialize objects which have already
been constructed. However, when Chrome tried to ship these semantics,
we ran into web compatibility issues.

This patch tries to square the circle and implement the simpler v2 object
semantics while including a compatibility workaround to allow objects to
sort of be initialized later, storing the real underlying Intl object
in a symbol-named property.

BUG=v8:4360, v8:4870
LOG=Y
R=adamk

[Dan Ehrenberg, 2016-03-25 02:53:39]

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

[commit-bot: I haz the power, 2016-03-25 02:53:41]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1828543007/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1828543007/20001

[Dan Ehrenberg, 2016-03-25 02:53:51]

Description was changed from

==========
Add new semantics + compat fallback to Intl constructor

ECMA 402 v2 made Intl constructors more strict in terms of how they would
initialize objects, refusing to initialize objects which have already
been constructed. However, when Chrome tried to ship these semantics,
we ran into web compatibility issues.

This patch tries to square the circle and implement the simpler v2 object
semantics while including a compatibility workaround to allow objects to
sort of be initialized later, storing the real underlying Intl object
in a symbol-named property.

BUG=v8:4360
LOG=Y
R=adamk
==========

to

==========
Add new semantics + compat fallback to Intl constructor

ECMA 402 v2 made Intl constructors more strict in terms of how they would
initialize objects, refusing to initialize objects which have already
been constructed. However, when Chrome tried to ship these semantics,
we ran into web compatibility issues.

This patch tries to square the circle and implement the simpler v2 object
semantics while including a compatibility workaround to allow objects to
sort of be initialized later, storing the real underlying Intl object
in a symbol-named property.

BUG=v8:4360,v8:4870
LOG=Y
R=adamk
==========

[commit-bot: I haz the power, 2016-03-25 03:09:03]

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

[commit-bot: I haz the power, 2016-03-25 03:09:04]

Dry run: Try jobs failed on following builders:
  v8_linux64_avx2_rel on tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_linux64_avx2_rel/builds/...)