Rewrite #includes for llvm/Foo.h to llvm/IR/Foo.h as appropriate to
reflect the migration in r171366.

llvm-svn: 171370
diff --git a/polly/lib/CodeGen/Utils.cpp b/polly/lib/CodeGen/Utils.cpp
index a9dc896..ad216ca 100644
--- a/polly/lib/CodeGen/Utils.cpp
+++ b/polly/lib/CodeGen/Utils.cpp
@@ -15,7 +15,7 @@
 
 #include "polly/ScopInfo.h"
 
-#include "llvm/IRBuilder.h"
+#include "llvm/IR/IRBuilder.h"
 #include "llvm/Support/Debug.h"
 #include "llvm/Transforms/Utils/BasicBlockUtils.h"