Fix the CMake build.

llvm-svn: 135573
diff --git a/llvm/lib/MC/CMakeLists.txt b/llvm/lib/MC/CMakeLists.txt
index 64625be..d646874 100644
--- a/llvm/lib/MC/CMakeLists.txt
+++ b/llvm/lib/MC/CMakeLists.txt
@@ -21,6 +21,7 @@
   MCMachOStreamer.cpp
   MCMachObjectTargetWriter.cpp
   MCNullStreamer.cpp
+  MCObjectFileInfo.cpp
   MCObjectStreamer.cpp
   MCObjectWriter.cpp
   MCPureStreamer.cpp