How to debug assert failure in awt.dll?

[Pete Brunet]

Using code cloned from yesterday, I built the jdk portion of the 7u-dev
forest using the debug target and the 7u45 import and am getting an
assert failure in Hashtable.cpp when accessibility is enabled.  This is
a 32 bit build using a 32 bit import.

Letting the execution transition into the debugger stops pointing at
awt.dll.

How do I debug this?  Assuming having debug symbols would help, I set
the Visual Studio debugger symbols dialog to point at either of these
two directories but the debugger fails to find the symbols:
jdk7u-dev\jdk\build\windows-i586\tmp\sun\sun.awt\awt\obj_g or obj_gO.

Pete