[AArch64] Fix gcc.dg/torture/float32-builtin.c with RTL checking

    * config/aarch64/predicates.md (aarch64_reg_or_fp_zero): Check for
    const_double code before calling aarch64_float_const_zero_rtx_p.

From-SVN: r242539

gcc/ChangeLog

+2016-11-17  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>
+
+	* config/aarch64/predicates.md (aarch64_reg_or_fp_zero): Check for
+	const_double code before calling aarch64_float_const_zero_rtx_p.
+
 2016-11-17  Richard Biener  <rguenther@suse.de>
 
 	PR tree-optimization/78306

gcc/config/aarch64/predicates.md

@@ -54,9 +54,9 @@
 	    (match_test "op == const0_rtx"))))
 
 (define_predicate "aarch64_reg_or_fp_zero"
-  (and (match_code "reg,subreg,const_double")
-       (ior (match_operand 0 "register_operand")
-	    (match_test "aarch64_float_const_zero_rtx_p (op)"))))
+  (ior (match_operand 0 "register_operand")
+	(and (match_code "const_double")
+	     (match_test "aarch64_float_const_zero_rtx_p (op)"))))
 
 (define_predicate "aarch64_reg_zero_or_m1_or_1"
   (and (match_code "reg,subreg,const_int")