gcc/

	* gimple-ssa-strength-reduction.c (legal_cast_p_1): Forward
	declaration.
	(backtrace_base_for_ref): Call get_unwidened with 'base_in' if
	'base_in' represent a conversion and legal_cast_p_1 holds; set
	'base_in' with the returned value from get_unwidened.

gcc/testsuite/

	* gcc.dg/tree-ssa/slsr-40.c: New test.

From-SVN: r203107