Provide a method to clear the current state of a TypeLocBuilder.

llvm-svn: 105800

Author: rjmccall

clang/include/clang/AST/TypeLocBuilder.h

@@ -79,7 +79,14 @@ class TypeLocBuilder {
     size_t LocalSize = TypeSpecTypeLoc::LocalDataSize;
     return cast<TypeSpecTypeLoc>(pushImpl(T, LocalSize));
   }
-  
+
+  /// Resets this builder to the newly-initialized state.
+  void clear() {
+#ifndef NDEBUG
+    LastTy = QualType();
+#endif
+    Index = Capacity;
+  }  
 
   /// Pushes space for a new TypeLoc of the given type.  Invalidates
   /// any TypeLocs previously retrieved from this builder.