re PR middle-end/39360 (ICE in referenced_var_lookup, at tree-dfa.c:563)

re PR middle-end/39360 (ICE in referenced_var_lookup, at tree-dfa.c:563)

	PR middle-end/39360
	* tree-flow.h (add_referenced_var): Return bool instead of void.
	* tree-dfa.c (add_referenced_var): Return result of
	referenced_var_check_and_insert call.
	* tree-inline.c (expand_call_inline): Call add_referenced_var instead
	of referenced_var_check_and_insert.

	* gcc.c-torture/compile/pr39360.c: New test.

From-SVN: r144683