Eagerly extract stack limit from Isolate in InitializeAstVisitor()

Eagerly extract stack limit from Isolate in InitializeAstVisitor()

Previously, any AstVisitor subclasses which wanted to make use of
the shared stack overflow checking code needed to depend on Isolate.

With this patch, it will be easy to create a second InitializeAstVisitor
overload taking a stack_limit directly, for use in code that has no
Isolate available (such as code running in the parser).

AstVisitor subclasses which depended upon the isolate() accessor have
been fixed to either have their own isolate_ member or get it from
somewhere else convenient.

Committed: https://crrev.com/d317145d05f25232f8c45f5b8ed98e2df6610afb
Cr-Commit-Position: refs/heads/master@{#31260}

[adamk, 2015-10-14 12:21:47]

adamk@chromium.org changed reviewers:
+ mstarzinger@chromium.org

[Michael Starzinger, 2015-10-14 12:36:28]

LGTM.

[adamk, 2015-10-14 12:43:40]

The CQ bit was checked by adamk@chromium.org

[commit-bot: I haz the power, 2015-10-14 12:43:51]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1387383005/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1387383005/1

[commit-bot: I haz the power, 2015-10-14 13:04:53]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-10-14 13:05:05]

Patchset 1 (id:??) landed as
https://crrev.com/d317145d05f25232f8c45f5b8ed98e2df6610afb
Cr-Commit-Position: refs/heads/master@{#31260}