Update LLVM for 3.5 rebase (r209712).

Change-Id: I149556c940fb7dc92d075273c87ff584f400941f
diff --git a/tools/llvm-diff/DiffLog.cpp b/tools/llvm-diff/DiffLog.cpp
index caf779b..24a1b08 100644
--- a/tools/llvm-diff/DiffLog.cpp
+++ b/tools/llvm-diff/DiffLog.cpp
@@ -35,11 +35,11 @@
 }
 void DiffLogBuilder::addLeft(Instruction *L) {
   // HACK: VS 2010 has a bug in the stdlib that requires this.
-  Diff.push_back(DiffRecord(L, DiffRecord::second_type(0)));
+  Diff.push_back(DiffRecord(L, DiffRecord::second_type(nullptr)));
 }
 void DiffLogBuilder::addRight(Instruction *R) {
   // HACK: VS 2010 has a bug in the stdlib that requires this.
-  Diff.push_back(DiffRecord(DiffRecord::first_type(0), R));
+  Diff.push_back(DiffRecord(DiffRecord::first_type(nullptr), R));
 }
 
 unsigned DiffLogBuilder::getNumLines() const { return Diff.size(); }
diff --git a/tools/llvm-diff/DifferenceEngine.h b/tools/llvm-diff/DifferenceEngine.h
index 73bf6eb..4470968 100644
--- a/tools/llvm-diff/DifferenceEngine.h
+++ b/tools/llvm-diff/DifferenceEngine.h
@@ -59,7 +59,7 @@
     };
 
     DifferenceEngine(Consumer &consumer)
-      : consumer(consumer), globalValueOracle(0) {}
+      : consumer(consumer), globalValueOracle(nullptr) {}
 
     void diff(Module *L, Module *R);
     void diff(Function *L, Function *R);