Parser cleanup: less member variables.

Parser cleanup: less member variables.

Parser had unnecessary member pointers to stuff stored in the
CompilationInfo (which Parser also points to).

As we add more parsing code paths (in particular, script streaming), this gets
confusing and Parser and CompilationInfo can get out of sync.

BUG=
R=jochen@chromium.org, rossberg@chromium.org

Committed: https://code.google.com/p/v8/source/detail?r=23861

[marja, 2014-09-02 15:45:12]

marja@chromium.org changed reviewers:
+ rossberg@chromium.org

[marja, 2014-09-02 15:45:13]

rossberg, ptal

[jochen (gone - plz use gerrit), 2014-09-04 13:11:34]

jochen@chromium.org changed reviewers:
+ jochen@chromium.org

[jochen (gone - plz use gerrit), 2014-09-04 13:11:34]

lgtm

[rossberg, 2014-09-08 14:11:27]

lgtm

[marja, 2014-09-11 09:52:46]

Committed patchset #1 (id:1) manually as 23861 (presubmit successful).