aarch64 - PR target/86887 Fix missing register constraints in carryin patterns

Some of the carryin insn patterns are missing a register constraint.
That means that the register allocator can pick practically anything
to hold that value, including memory locations, or registers of the
wrong class.

	PR target/86887
	* config/aarch64/aarch64.md (add<mode>3_carryinC_zero): Add missing
	register constraint to operand 0.
	(add<mode>3_carryinC): Likewise.
	(add<mode>3_carryinV_zero, add<mode>3_carryinV): Likewise.

From-SVN: r263446

gcc/ChangeLog

+2018-08-09  Richard Earnshaw  <rearnsha@arm.com>
+
+	PR target/86887
+	* config/aarch64/aarch64.md (add<mode>3_carryinC_zero): Add missing
+	register constraint to operand 0.
+	(add<mode>3_carryinC): Likewise.
+	(add<mode>3_carryinV_zero, add<mode>3_carryinV): Likewise.
+
 2018-08-09  Martin Liska  <mliska@suse.cz>
 
         PR c/86895

gcc/config/aarch64/aarch64.md

@@ -2451,7 +2451,7 @@
 	    (plus:GPI
 	      (match_operand:GPI 3 "aarch64_carry_operation" "")
 	      (match_dup 1)))))
-   (set (match_operand:GPI 0 "register_operand")
+   (set (match_operand:GPI 0 "register_operand" "=r")
 	(plus:GPI (match_dup 3) (match_dup 1)))]
    ""
    "adcs\\t%<w>0, %<w>1, <w>zr"
@@ -2472,7 +2472,7 @@
 		(match_operand:GPI 4 "aarch64_carry_operation" "")
 		(match_dup 1))
 	      (match_dup 2)))))
-   (set (match_operand:GPI 0 "register_operand")
+   (set (match_operand:GPI 0 "register_operand" "=r")
 	(plus:GPI
 	  (plus:GPI (match_dup 4) (match_dup 1))
 	  (match_dup 2)))]
@@ -2517,7 +2517,7 @@
 	    (plus:GPI
 	      (match_operand:GPI 3 "aarch64_carry_operation" "")
 	      (match_dup 1)))))
-   (set (match_operand:GPI 0 "register_operand")
+   (set (match_operand:GPI 0 "register_operand" "=r")
 	(plus:GPI (match_dup 3) (match_dup 1)))]
    ""
    "adcs\\t%<w>0, %<w>1, <w>zr"
@@ -2538,7 +2538,7 @@
 		(match_operand:GPI 4 "aarch64_carry_operation" "")
 		(match_dup 1))
 	      (match_dup 2)))))
-   (set (match_operand:GPI 0 "register_operand")
+   (set (match_operand:GPI 0 "register_operand" "=r")
 	(plus:GPI
 	  (plus:GPI (match_dup 4) (match_dup 1))
 	  (match_dup 2)))]