This patch is a big refactoring of llvm-diff. It doesn't add new features, but it re-organizes the old features, so I can insert the MetadataEngine to use the same infrastructure.

llvm-svn: 127627
diff --git a/llvm/tools/llvm-diff/CMakeLists.txt b/llvm/tools/llvm-diff/CMakeLists.txt
index f6d65c9..c59d69e 100644
--- a/llvm/tools/llvm-diff/CMakeLists.txt
+++ b/llvm/tools/llvm-diff/CMakeLists.txt
@@ -2,5 +2,7 @@
 
 add_llvm_tool(llvm-diff
   llvm-diff.cpp
+  DiffConsumer.cpp
+  DiffLog.cpp
   DifferenceEngine.cpp
   )