Two fast/js tests crash: fast/js/excessive-comma-usage.html and fast/js/math-transforms.html. See <http://build.webkit.org/results/Windows%20Release%20(Tests)/r51675%20(6688)/results.html> for an example of the crashes.
This started happening between r51670 and r51675. The new "rope" JS string representation landed in this range, and seems likely to be the culprit.
*** Bug 32228 has been marked as a duplicate of this bug. ***
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Committed revision 51933.