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

Re-sort the #include lines to reflect the new paths.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@171369 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/BackendUtil.cpp b/lib/CodeGen/BackendUtil.cpp
index f9d3a17..5abac4a 100644
--- a/lib/CodeGen/BackendUtil.cpp
+++ b/lib/CodeGen/BackendUtil.cpp
@@ -18,9 +18,9 @@
 #include "llvm/Bitcode/ReaderWriter.h"
 #include "llvm/CodeGen/RegAllocRegistry.h"
 #include "llvm/CodeGen/SchedulerRegistry.h"
-#include "llvm/DataLayout.h"
+#include "llvm/IR/DataLayout.h"
+#include "llvm/IR/Module.h"
 #include "llvm/MC/SubtargetFeature.h"
-#include "llvm/Module.h"
 #include "llvm/PassManager.h"
 #include "llvm/Support/CommandLine.h"
 #include "llvm/Support/FormattedStream.h"