PPC: [runtime] Replace global object link with native context link in all contexts.

PPC: [runtime] Replace global object link with native context link in all contexts.

Port 47502a238b8185a864bfe6a8d5508b4e67cad40e

Original commit message:
    Previously all contexts had a link to the global object, but what is
    required in most cases (except for the global load, store and delete
    case) is the native context.

    This also removes the second dummy global object that was still linked
    to every native context. We will add a different mechanism to ensure
    that builtins do not pollute the actual global object during
    bootstrapping.

    Drive-by-fix: Unify some MacroAssembler magic and drop obsolete stuff.

R=bmeurer@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com
BUG=

Committed: https://crrev.com/aeab4a96501ec6c74724b2df3fff134fc4ca5cbc
Cr-Commit-Position: refs/heads/master@{#32435}

[michael_dawson, 2015-11-30 21:33:02]

On 2015/11/30 21:02:46, mtbrandyberry wrote:

lgtm

[john.yan, 2015-11-30 22:53:40]

lgtm

[MTBrandyberry, 2015-12-01 03:36:08]

The CQ bit was checked by mbrandy@us.ibm.com

[commit-bot: I haz the power, 2015-12-01 03:36:11]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1491433002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1491433002/1

[commit-bot: I haz the power, 2015-12-01 03:53:32]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-12-01 03:53:54]

Description was changed from

==========
PPC: [runtime] Replace global object link with native context link in all
contexts.

Port 47502a238b8185a864bfe6a8d5508b4e67cad40e

Original commit message:
    Previously all contexts had a link to the global object, but what is
    required in most cases (except for the global load, store and delete
    case) is the native context.

    This also removes the second dummy global object that was still linked
    to every native context. We will add a different mechanism to ensure
    that builtins do not pollute the actual global object during
    bootstrapping.

    Drive-by-fix: Unify some MacroAssembler magic and drop obsolete stuff.

R=bmeurer@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com,
michael_dawson@ca.ibm.com
BUG=
==========

to

==========
PPC: [runtime] Replace global object link with native context link in all
contexts.

Port 47502a238b8185a864bfe6a8d5508b4e67cad40e

Original commit message:
    Previously all contexts had a link to the global object, but what is
    required in most cases (except for the global load, store and delete
    case) is the native context.

    This also removes the second dummy global object that was still linked
    to every native context. We will add a different mechanism to ensure
    that builtins do not pollute the actual global object during
    bootstrapping.

    Drive-by-fix: Unify some MacroAssembler magic and drop obsolete stuff.

R=bmeurer@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com,
michael_dawson@ca.ibm.com
BUG=

Committed: https://crrev.com/aeab4a96501ec6c74724b2df3fff134fc4ca5cbc
Cr-Commit-Position: refs/heads/master@{#32435}
==========

[commit-bot: I haz the power, 2015-12-01 03:53:55]

Patchset 1 (id:??) landed as
https://crrev.com/aeab4a96501ec6c74724b2df3fff134fc4ca5cbc
Cr-Commit-Position: refs/heads/master@{#32435}