* gimple-low.c (struct lower_data): Replace the_return_label and
one_return_stmt with return_statements.
(lower_function_body): Process the entire list of return_statements.
(lower_return_expr): Check source value before unifying return_exprs.
* gimplify.c (gimplify_return_expr): Force the use of a temporary
for !aggregate_value_p.
* tree-gimple.c: Update RETURN_EXPR grammer.
From-SVN: r82768
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