Implement C++0x nullptr.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@71405 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Parse/ParseExpr.cpp b/lib/Parse/ParseExpr.cpp
index 509aa0f..bfbac3a 100644
--- a/lib/Parse/ParseExpr.cpp
+++ b/lib/Parse/ParseExpr.cpp
@@ -430,6 +430,7 @@
 ///         constant
 ///         string-literal
 /// [C++]   boolean-literal  [C++ 2.13.5]
+/// [C++0x] 'nullptr'        [C++0x 2.14.7]
 ///         '(' expression ')'
 ///         '__func__'        [C99 6.4.2.2]
 /// [GNU]   '__FUNCTION__'
@@ -569,6 +570,9 @@
   case tok::kw_false:
     return ParseCXXBoolLiteral();
 
+  case tok::kw_nullptr:
+    return Actions.ActOnCXXNullPtrLiteral(ConsumeToken());
+
   case tok::identifier: {      // primary-expression: identifier
                                // unqualified-id: identifier
                                // constant: enumeration-constant