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/SystemZ/SystemZSubtarget.cpp b/llvm/lib/Target/SystemZ/SystemZSubtarget.cpp
index eb5e5c0..0b49fcd 100644
--- a/llvm/lib/Target/SystemZ/SystemZSubtarget.cpp
+++ b/llvm/lib/Target/SystemZ/SystemZSubtarget.cpp
@@ -42,7 +42,7 @@
       HasTransactionalExecution(false), HasProcessorAssist(false),
       HasVector(false), TargetTriple(TT),
       InstrInfo(initializeSubtargetDependencies(CPU, FS)), TLInfo(TM, *this),
-      TSInfo(*TM.getDataLayout()), FrameLowering() {}
+      TSInfo(), FrameLowering() {}
 
 // Return true if GV binds locally under reloc model RM.
 static bool bindsLocally(const GlobalValue *GV, Reloc::Model RM) {