Remove unused private fields found by clang's new -Wunused-private-field.

There are some that I didn't remove this round because they looked like
obvious stubs. There are dead variables in gtest too, they should be
fixed upstream.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@158090 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/tools/llvm-diff/llvm-diff.cpp b/tools/llvm-diff/llvm-diff.cpp
index 774169b..45957b3 100644
--- a/tools/llvm-diff/llvm-diff.cpp
+++ b/tools/llvm-diff/llvm-diff.cpp
@@ -78,8 +78,8 @@
   Module *RModule = ReadModule(Context, RightFilename);
   if (!LModule || !RModule) return 1;
 
-  DiffConsumer Consumer(LModule, RModule);
-  DifferenceEngine Engine(Context, Consumer);
+  DiffConsumer Consumer;
+  DifferenceEngine Engine(Consumer);
 
   // If any global names were given, just diff those.
   if (!GlobalsToCompare.empty()) {