Take ast node id counting away from Isolate.

When we're going to parse multiple scripts in parallel, we cannot have the
Isolate count the ast node ids.

Now the counter is stored in CompilationInfo instead. This is because we need to
add ast nodes after parsing too.

R=rossberg@chromium.org
BUG=

Review URL: https://codereview.chromium.org/490173002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@23301 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Add finalize sweeping event to GCIdleTimeHandler.

BUG=
R=ulan@chromium.org

Review URL: https://codereview.chromium.org/479693004

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@23302 ce2b1a6d-e550-0410-aec6-3dcde31c8c00