Revert "Dispose Isolate at end of cctest."

Things work locally, only the waterfall is unhappy for some arcane reason.
Investigating...

TBR=bmeurer@chromium.org

Review URL: https://codereview.chromium.org/133193006

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@19049 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Tests for (pre)parse errors when "eval" and "arguments" are found in inappropriate places.

In addition:
- Fix a bug in parser discovered by the tests (prefix and postfix confused in an
  error message); the preparser had it right.
- Unify the parser and preparser error locations when the name of a function is
  "eval" or "arguments. Now both point to the name.

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

Review URL: https://codereview.chromium.org/140543003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@19050 ce2b1a6d-e550-0410-aec6-3dcde31c8c00