Parsing: Make Scope not know about Isolate.

Parsing: Make Scope not know about Isolate.

Scope, like Parser, must be able to operate independent of Isolate and the V8
heap (for background parsing). After the heap-independent phase, there is a heap
dependent phase, during which we do operations such as scope anaylysis.

This CL makes the phases explicit by not telling Scope about the Isolate too
early (during the heap-independent phase, Scope should know nothing about
Isolate). This decreases the probability of accidental code changes which would
add heap-dependent operations into the heap-independent phase.

R=rossberg@chromium.org
BUG=

Committed: https://crrev.com/5d68529be240a1fc9fcc67c8950ead4baf7604e4
Cr-Commit-Position: refs/heads/master@{#26546}

[marja, 2015-02-10 13:59:40]

rossberg, ptal. moar refactoring.

[rossberg, 2015-02-10 14:37:00]

lgtm

[marja, 2015-02-10 14:37:49]

The CQ bit was checked by marja@chromium.org

[commit-bot: I haz the power, 2015-02-10 14:37:52]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/909093003/1

[commit-bot: I haz the power, 2015-02-10 14:39:08]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-02-10 14:39:44]

Patchset 1 (id:??) landed as
https://crrev.com/5d68529be240a1fc9fcc67c8950ead4baf7604e4
Cr-Commit-Position: refs/heads/master@{#26546}