update CMakeLists.txt

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@108620 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/CMakeLists.txt b/lib/CodeGen/CMakeLists.txt
index ffeff1e..078bb19 100644
--- a/lib/CodeGen/CMakeLists.txt
+++ b/lib/CodeGen/CMakeLists.txt
@@ -67,6 +67,7 @@
   SjLjEHPrepare.cpp
   SlotIndexes.cpp
   Spiller.cpp
+  Splitter.cpp
   StackProtector.cpp
   StackSlotColoring.cpp
   StrongPHIElimination.cpp