LGTM.

http://codereview.chromium.org/27200/diff/16/1012
File src/codegen-ia32.cc (right):

http://codereview.chromium.org/27200/diff/16/1012#newcode2168
Line 2168:
Could you put a comment here, indicating the possible states of (1)
fallthrough links to and from the default clause
(2) fallthrough link to remaining cases, that are only reached by
fallthrough
(3) next_test link to the default clause, as bound fallthrough or as
linked target.

http://codereview.chromium.org/27200/diff/16/1012#newcode2174
Line 2174: VisitStatements(cases->at(index)->statements());
Should you break on no frame here, or is VisitStatements guarded by a
sufficiently fast check for a valid frame?

http://codereview.chromium.org/27200/diff/16/1012#newcode2180
Line 2180: // The last clause compiled was unconditionally true.  We
still
The last test compiled?
Can't many fall-through clauses be compiled after this test?

http://codereview.chromium.org/27200

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