Update LLVM for 3.5 rebase (r209712).

Change-Id: I149556c940fb7dc92d075273c87ff584f400941f
diff --git a/lib/ExecutionEngine/Interpreter/Interpreter.h b/lib/ExecutionEngine/Interpreter/Interpreter.h
index 2e93cae..2145cde 100644
--- a/lib/ExecutionEngine/Interpreter/Interpreter.h
+++ b/lib/ExecutionEngine/Interpreter/Interpreter.h
@@ -108,7 +108,7 @@
   
   /// create - Create an interpreter ExecutionEngine. This can never fail.
   ///
-  static ExecutionEngine *create(Module *M, std::string *ErrorStr = 0);
+  static ExecutionEngine *create(Module *M, std::string *ErrorStr = nullptr);
 
   /// run - Start execution with the specified function and arguments.
   ///
@@ -118,7 +118,7 @@
   void *getPointerToNamedFunction(const std::string &Name,
                                   bool AbortOnFailure = true) override {
     // FIXME: not implemented.
-    return 0;
+    return nullptr;
   }
 
   /// recompileAndRelinkFunction - For the interpreter, functions are always