[C++11] Use 'nullptr'.

llvm-svn: 208280
diff --git a/clang/lib/Basic/TokenKinds.cpp b/clang/lib/Basic/TokenKinds.cpp
index 92fc2a2..3b1f8fe 100644
--- a/clang/lib/Basic/TokenKinds.cpp
+++ b/clang/lib/Basic/TokenKinds.cpp
@@ -19,14 +19,14 @@
 #define TOK(X) #X,
 #define KEYWORD(X,Y) #X,
 #include "clang/Basic/TokenKinds.def"
-  0
+  nullptr
 };
 
 const char *tok::getTokenName(TokenKind Kind) {
   if (Kind < tok::NUM_TOKENS)
     return TokNames[Kind];
   llvm_unreachable("unknown TokenKind");
-  return 0;
+  return nullptr;
 }
 
 const char *tok::getPunctuatorSpelling(TokenKind Kind) {
@@ -35,7 +35,7 @@
 #include "clang/Basic/TokenKinds.def"
   default: break;
   }
-  return 0;
+  return nullptr;
 }
 
 const char *tok::getKeywordSpelling(TokenKind Kind) {
@@ -44,5 +44,5 @@
 #include "clang/Basic/TokenKinds.def"
     default: break;
   }
-  return 0;
+  return nullptr;
 }