[tree-ssa] PATCH to tree_ssa_useless_type_conversion

[Jason Merrill]

As I commented to Jeff previously, we don't care about conversions between
pointer and reference type once we've left the front end.

I haven't checked the impact of this change on optimization, but I would
expect it to help C++ somewhat.

Tested athlon-pc-linux-gnu, applied to tree-ssa.

2003-08-19  Jason Merrill  <jason@redhat.com>

	* tree-ssa.c (tree_ssa_useless_type_conversion): Also strip
	conversions between pointer and reference types.

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