Reviewers: Vyacheslav Egorov,

Description:
Optimize the common obfuscator pattern where ["foo","bar","baz"]
gets converted fo "foo,bar,baz".split(",").  If the inputs are
symbols we cache the result and make the substrings into symbols.

Please review this at http://codereview.chromium.org/7782025/

SVN Base: http://v8.googlecode.com/svn/branches/bleeding_edge/

Affected files:
  M     src/heap.h
  M     src/heap.cc
  M     src/runtime.cc


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