C++ PATCH to cxx_types_compatible_p

[Jason Merrill]

To the middle-end, there is no difference between references and pointers,
so we don't need to retain casts between them.

Tested x86_64-pc-linux-gnu, applied to trunk.

2004-07-15  Jason Merrill  <jason@redhat.com>

	* cp-lang.c (cxx_types_compatible_p): To the middle-end,
	references and pointers are compatible.

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