Remove getDataLayout() from TargetSelectionDAGInfo (had no users)

Summary:
Remove empty subclass in the process.

This change is part of a series of commits dedicated to have a single
DataLayout during compilation by using always the one owned by the
module.

Reviewers: echristo

Subscribers: jholewinski, llvm-commits, rafael, yaron.keren, ted

Differential Revision: http://reviews.llvm.org/D11045

From: Mehdi Amini <mehdi.amini@apple.com>
llvm-svn: 241780
diff --git a/llvm/lib/Target/PowerPC/PPCSubtarget.h b/llvm/lib/Target/PowerPC/PPCSubtarget.h
index e9cc3d4..0616c1f 100644
--- a/llvm/lib/Target/PowerPC/PPCSubtarget.h
+++ b/llvm/lib/Target/PowerPC/PPCSubtarget.h
@@ -17,10 +17,10 @@
 #include "PPCFrameLowering.h"
 #include "PPCISelLowering.h"
 #include "PPCInstrInfo.h"
-#include "PPCSelectionDAGInfo.h"
 #include "llvm/ADT/Triple.h"
 #include "llvm/IR/DataLayout.h"
 #include "llvm/MC/MCInstrItineraries.h"
+#include "llvm/Target/TargetSelectionDAGInfo.h"
 #include "llvm/Target/TargetSubtargetInfo.h"
 #include <string>
 
@@ -129,7 +129,7 @@
   PPCFrameLowering FrameLowering;
   PPCInstrInfo InstrInfo;
   PPCTargetLowering TLInfo;
-  PPCSelectionDAGInfo TSInfo;
+  TargetSelectionDAGInfo TSInfo;
 
 public:
   /// This constructor initializes the data members to match that
@@ -164,7 +164,7 @@
   const PPCTargetLowering *getTargetLowering() const override {
     return &TLInfo;
   }
-  const PPCSelectionDAGInfo *getSelectionDAGInfo() const override {
+  const TargetSelectionDAGInfo *getSelectionDAGInfo() const override {
     return &TSInfo;
   }
   const PPCRegisterInfo *getRegisterInfo() const override {