Handle the memory-ness of all U+ ARM constraints.

Noticed on inspection.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@133553 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/ARM/ARMISelLowering.cpp b/lib/Target/ARM/ARMISelLowering.cpp
index dc193e0..4ae4af1 100644
--- a/lib/Target/ARM/ARMISelLowering.cpp
+++ b/lib/Target/ARM/ARMISelLowering.cpp
@@ -7379,9 +7379,12 @@
     case 'l': return C_RegisterClass;
     case 'w': return C_RegisterClass;
     }
-  } else {
-    if (Constraint == "Uv")
-      return C_Memory;
+  } else if (Constraint.size() == 2) {
+    switch (Constraint[0]) {
+    default: break;
+    // All 'U+' constraints are addresses.
+    case 'U': return C_Memory;
+    }
   }
   return TargetLowering::getConstraintType(Constraint);
 }