On ARM make sure that we continue translating 'p' to 'r' for the
constraints.

rdar://9618597


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@133222 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Basic/Targets.cpp b/lib/Basic/Targets.cpp
index 21be929..b6715bb 100644
--- a/lib/Basic/Targets.cpp
+++ b/lib/Basic/Targets.cpp
@@ -2069,6 +2069,9 @@
       R = std::string("^") + std::string(Constraint, 2);
       Constraint++;
       break;
+    case 'p': // 'p' should be translated to 'r' by default.
+      R = std::string("r");
+      break;
     default:
       return std::string(1, *Constraint);
     }