gcse.c (can_assign_to_reg_without_clobbers_p): Do not let pointers from test_insn into GGC space escape via SET_SRC.

	* gcse.c (can_assign_to_reg_without_clobbers_p): Do not let pointers
	from test_insn into GGC space escape via SET_SRC.

From-SVN: r211347