http://codereview.chromium.org/113400/diff/1/3
File src/ia32/virtual-frame-ia32.cc (right):

http://codereview.chromium.org/113400/diff/1/3#newcode194
Line 194: elements_[i].clear_copied();
It's annoying because we have to see the copy (later) to know if this
one should be marked copied.

The real problem is that the copy flags are conservative (it's safe to
be marked if not actually copied), so there is no good reason for
setting or clearing them at all.  It's here for the merging code but we
can refactor that so it doesn't matter.

http://codereview.chromium.org/113400

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