[runtime] Share constructor/non-constructor bound function maps.

[runtime] Share constructor/non-constructor bound function maps.

Properly share both the constructor and the non-constructor maps
for bound functions. Previously we had only the non-constructor
map shared on the native context, and we had to create a new map
for every bound function whose [[BoundTargetFunction]] is a
constructor (in the ES6 sense).

This should repair the most recent regression on Speedometer.

CQ_INCLUDE_TRYBOTS=tryserver.v8:v8_linux_nosnap_dbg
R=jarin@chromium.org
BUG=chromium:536114, chromium:535408, v8:4430
LOG=n

Committed: https://crrev.com/6f81ee6a3de999380927730ce6f00958c93d2044
Cr-Commit-Position: refs/heads/master@{#31086}

[Benedikt Meurer, 2015-10-02 10:13:20]

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

[commit-bot: I haz the power, 2015-10-02 10:13:26]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1379323002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1379323002/1

[commit-bot: I haz the power, 2015-10-02 12:19:46]

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

[commit-bot: I haz the power, 2015-10-02 12:19:47]

Dry run: Try jobs failed on following builders:
  v8_linux_layout_dbg on tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_linux_layout_dbg/builds/...)

[Jarin, 2015-10-02 13:21:37]

lgtm (modulo the failing layout tests)

[Benedikt Meurer, 2015-10-02 14:14:34]

The CQ bit was checked by bmeurer@chromium.org

[commit-bot: I haz the power, 2015-10-02 14:14:57]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1379323002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1379323002/1

[commit-bot: I haz the power, 2015-10-02 16:15:21]

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

[commit-bot: I haz the power, 2015-10-02 16:15:22]

Try jobs failed on following builders:
  v8_linux_layout_dbg on tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_linux_layout_dbg/builds/...)

[Benedikt Meurer, 2015-10-02 16:48:22]

On 2015/10/02 13:21:37, Jarin wrote:
> lgtm (modulo the failing layout tests)

Thanks. The blink test failures are unrelated to my CL, they don't even run any
JS.

[Benedikt Meurer, 2015-10-02 16:49:26]

On 2015/10/02 16:48:22, Benedikt Meurer wrote:
> On 2015/10/02 13:21:37, Jarin wrote:
> > lgtm (modulo the failing layout tests)
> 
> Thanks. The blink test failures are unrelated to my CL, they don't even run
any
> JS.

Same tests are failing on the Chromium waterfall currently:
http://build.chromium.org/p/chromium.webkit/builders/WebKit%20Linux%20%28dbg%...

[Benedikt Meurer, 2015-10-02 16:49:31]

The CQ bit was checked by bmeurer@chromium.org

[commit-bot: I haz the power, 2015-10-02 16:49:39]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1379323002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1379323002/1

[commit-bot: I haz the power, 2015-10-02 16:51:26]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-10-02 16:51:42]

Patchset 1 (id:??) landed as
https://crrev.com/6f81ee6a3de999380927730ce6f00958c93d2044
Cr-Commit-Position: refs/heads/master@{#31086}