PATCH to gimplify_modify_expr to avoid extra copies

[Jason Merrill]

I'm applying this patch.  Tested x86_64-pc-linux-gnu.

2004-06-11  Jason Merrill  <jason@redhat.com>

	* tree-ssa-operands.c: Use a V_MAY_DEF if the assignment might
	throw.
	* tree-eh.c (tree_could_throw_p): Support non-call exceptions in
	expressions.

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