Dispatch tables

- Implemented dispatch tables that takes a number of arbitrary indexed
  character ranges and turns them into a set of disjoint ranges with an
  associated set of the indices of the character ranges from which they
  originated.
- Removed the complicated character range implementation and the
  associated tests.
- Implemented the remaining character class escapes and simplified a
  few tests that had become complicated with the translation of class
  escapes to simple ranges.

[Erik Corry, 2008-11-04 09:48:57]

LGTM

http://codereview.chromium.org/9104/diff/1/6
File src/jsregexp.cc (right):

http://codereview.chromium.org/9104/diff/1/6#newcode908
Line 908: ZoneList<CharacterRange>* ranges) {
I guess it's implicit here that the class does not contain 0 of ffff?