Get more useful stack traces for internal errors/panics which happen
during the exit cleanup.  Also, don't report stack growth failures if
the fault is actually way above the stack.

MERGED FROM CVS HEAD



git-svn-id: svn://svn.valgrind.org/valgrind/trunk@3322 a5019735-40e9-0310-863c-91ae7b9d1cf9
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