[webkit-dev] Confusing crash on build.webkit.org

[Eric Seidel]

ASSERTION FAILED: malloc_size(p)
(/Volumes/Big/WebKit-BuildSlave/leopard-intel-debug/build/WebKitBuild/Debug/JavaScriptCore.framework/PrivateHeaders/ValueCheck.h:52
static void WTF::ValueCheck<P*>::checkConsistency(const P*) [with P =
WebCore::AtomicStringImpl])

http://build.webkit.org/results/Leopard%20Intel%20Debug%20(Tests)/r54686%20(10385)/fast/forms/old-names-stderr.txt

The checkins look unrelated, but I doubt this is a flake given that
it's an ASSERT.

Thoughts?  I'm happy to file a bug.

-eric