A small collection of cleanup in the parser and AST.

A small collection of cleanup in the parser and AST.

* Remove a couple of unused fields from the FunctionLiteral, ensure that all
  the bools are packed.
* Rename SaveScope and LexicalScope in the parser.
* Use an enum to generate the numbers 0..N and the dependent count, rather
  than static const ints.  This is simpler to extend (coming in a future
  change).

R=danno@chromium.org,keuchel@chromium.org
BUG=
TEST=

Committed: http://code.google.com/p/v8/source/detail?r=9933

[Steven, 2011-11-09 13:00:19]

LGTM.