[tree-ssa] PATCH to fix thinko in gimplify_return_expr

[Jason Merrill]

My earlier patch caused us to duplicate the assignment to the RESULT_DECL
in many cases.  Fixed thus.

I also considered using "tsi_last_p" instead of "tsi_one_before_end_p", but
decided that the latter was less potentially confusing.

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

2003-06-30  Jason Merrill  <jason@redhat.com>

	* gimplify.c (gimplify_modify_expr): Also force a call with a
	possible nonlocal goto into a temporary.
	(gimplify_return_expr): Don't duplicate the MODIFY_EXPR.
	* tree-iterator.h (tsi_one_before_end_p): New fn.

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