Revert "Merge lib/Transforms into lib/ExecutionEngine."

This reverts commit cd52b55716a2e4d78b0a6609b041c3aeb45b40f2.
diff --git a/lib/ExecutionEngine/RSScript.h b/lib/ExecutionEngine/RSScript.h
index 4fc1f90..50a3eb3 100644
--- a/lib/ExecutionEngine/RSScript.h
+++ b/lib/ExecutionEngine/RSScript.h
@@ -24,12 +24,12 @@
 #include <stddef.h>
 
 #include <llvm/ADT/SmallVector.h>
-#include <llvm/Support/CodeGen.h>
 
 #include <bcc/bcc.h>
 #include <bcc/bcc_mccache.h>
 #include "bcc_internal.h"
 
+#include "Compiler.h"
 #include "Script.h"
 
 namespace llvm {