[C++11] Use 'nullptr'. Unittests edition.

llvm-svn: 210423
diff --git a/clang/unittests/ASTMatchers/Dynamic/RegistryTest.cpp b/clang/unittests/ASTMatchers/Dynamic/RegistryTest.cpp
index abacb6f..5d53924 100644
--- a/clang/unittests/ASTMatchers/Dynamic/RegistryTest.cpp
+++ b/clang/unittests/ASTMatchers/Dynamic/RegistryTest.cpp
@@ -40,7 +40,7 @@
   }
 
   VariantMatcher constructMatcher(StringRef MatcherName,
-                                  Diagnostics *Error = NULL) {
+                                  Diagnostics *Error = nullptr) {
     Diagnostics DummyError;
     if (!Error) Error = &DummyError;
     llvm::Optional<MatcherCtor> Ctor = lookupMatcherCtor(MatcherName);
@@ -53,7 +53,7 @@
 
   VariantMatcher constructMatcher(StringRef MatcherName,
                                   const VariantValue &Arg1,
-                                  Diagnostics *Error = NULL) {
+                                  Diagnostics *Error = nullptr) {
     Diagnostics DummyError;
     if (!Error) Error = &DummyError;
     llvm::Optional<MatcherCtor> Ctor = lookupMatcherCtor(MatcherName);
@@ -67,7 +67,7 @@
   VariantMatcher constructMatcher(StringRef MatcherName,
                                   const VariantValue &Arg1,
                                   const VariantValue &Arg2,
-                                  Diagnostics *Error = NULL) {
+                                  Diagnostics *Error = nullptr) {
     Diagnostics DummyError;
     if (!Error) Error = &DummyError;
     llvm::Optional<MatcherCtor> Ctor = lookupMatcherCtor(MatcherName);
@@ -110,7 +110,8 @@
   }
 
   bool hasCompletion(const CompVector &Comps, StringRef TypedText,
-                     StringRef MatcherDecl = StringRef(), unsigned *Index = 0) {
+                     StringRef MatcherDecl = StringRef(),
+                     unsigned *Index = nullptr) {
     for (CompVector::const_iterator I = Comps.begin(), E = Comps.end(); I != E;
          ++I) {
       if (I->TypedText == TypedText &&