Give more info in verbose mode when checking crashers, and stress the stack even more in the compiler crasher

Patch by Michael Henry.

This was the original intention, but it wasn't threaded all the way through due
to 'endtime'.  Also added a trivial assertion to get coverage of __str__.

Patch by Yves Dorfsman.

Close Issue 11570: Lib/test/test_distutils.py tries to mix 32 and 64 bits object files, doesn't obey LDFLAGS