[PATCH] c++/58796 Make nullptr match exception handlers of pointer type

[Jonathan Wakely]

This allows exception handlers of pointer and pointer to data members
to match exceptions of type std::nullptr_t.

Pointers to member functions don't work yet, because a nullptr_t
exception object is only a single word, and we need two words for a
pointer to member function, and we don't have anywhere to put those
two words in the exception object. I'm going to raise this with the
C++ ABI group to coordinate with other implementations.

Tested x86_64-linux, I plan to commit this to trunk soon.


libstdc++-v3:

	PR c++/58796
	* libsupc++/pbase_type_info.cc (__pbase_type_info::__do_catch): Make
	nullptr match handlers of pointer type.

gcc/testsuite:

	PR c++/58796
	* g++.dg/cpp0x/nullptr21.C: Remove void* handlers.
	* g++.dg/cpp0x/nullptr35.C: New test.



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