PR libstdc++/59392: Fix ARM EABI uncaught throw from unexpected exception handler

libstdc++-v3/
	PR libstdc++/59392
	* libsupc++/eh_call.cc (__cxa_call_unexpected): Call __do_catch with
	the address of a null pointer, not with a null pointer to pointer.
	Copy comment for this case from eh_personality.cc:__cxa_call_unexpected.
	* testsuite/18_support/bad_exception/59392.cc: New file.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@208519 138bc75d-0d04-0410-961f-82ee72b054a4