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>

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@241780 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/SelectionDAG/TargetSelectionDAGInfo.cpp

@@ -15,9 +15,5 @@
 #include "llvm/Target/TargetMachine.h"
 using namespace llvm;
 
-TargetSelectionDAGInfo::TargetSelectionDAGInfo(const DataLayout *DL)
-  : DL(DL) {
-}
-
 TargetSelectionDAGInfo::~TargetSelectionDAGInfo() {
 }