[arm] make arm_carry_operation and arm_borrow_operation duals

Arm_carry_operation and arm_borrow_operation are duals: given that we
have a comparison that returns a result that relies solely in the
carry flag one is the inverse of the other.  So there's no reason for
one to have a CC mode that the other does not have.  This patch
restores that equivalence.

	* config/arm/predicates.md (arm_borrow_operation): Handle CC_ADCmode.

From-SVN: r277289

gcc/ChangeLog

+2019-10-22  Richard Earnshaw  <rearnsha@arm.com>
+
+	* config/arm/predicates.md (arm_borrow_operation): Handle CC_ADCmode.
+
 2019-10-22  Richard Biener  <rguenther@suse.de>
 
 	PR tree-optimization/92173

gcc/config/arm/predicates.md

@@ -398,7 +398,7 @@
     machine_mode ccmode = GET_MODE (op0);
     if (ccmode == CC_Cmode)
       return GET_CODE (op) == GEU;
-    else if (ccmode == CCmode || ccmode == CC_RSBmode)
+    else if (ccmode == CCmode || ccmode == CC_RSBmode || ccmode == CC_ADCmode)
       return GET_CODE (op) == LTU;
     return false;
   }