(Pre)Parser: Simplify NewExpression handling (fixed).

(Pre)Parser: Simplify NewExpression handling (fixed).

Notes:
- We use simple recursion to keep track of how many "new" operators we have seen
  and where.
- This makes the self-baked stack class PositionStack in parser.cc unnecessary.
- Now the logic is also unified between Parser and PreParser.
- This is a fixed version of r19386.

R=ulan@chromium.org
BUG=v8:3126
LOG=N

Committed: https://code.google.com/p/v8/source/detail?r=19417

[marja, 2014-02-17 15:12:04]

ulan, ptal of this fixed version.

I commented here: https://codereview.chromium.org/166943002/ what the bug was.

[ulan, 2014-02-17 15:22:58]

lgtm

[marja, 2014-02-17 15:41:06]

Committed patchset #3 manually as r19417 (presubmit successful).