[PATCH] Move the DataLayout to the generic TargetMachine, making it mandatory.

[Mehdi AMINI]

Hi echristo,

I don't know why every singled backend had to redeclare its own DataLayout.
There was a virtual getDataLayout() on the common base TargetMachine, the
default implementation returned nullptr. It was not clear from this that
we could assume at call site that a DataLayout will be available with 
each Target.

Now getDataLayout() is no longer virtual and return a pointer to the
DataLayout member of the common base TargetMachine. I plan to turn it into
a reference in a future patch.

The only backend that didn't have a DataLayout previsouly was the CPPBackend. 
It now initializes the default DataLayout. This commit is NFC for all the 
other backends.

http://reviews.llvm.org/D8243

Files:
  include/llvm/Target/TargetMachine.h
  lib/CodeGen/LLVMTargetMachine.cpp
  lib/Target/AArch64/AArch64TargetMachine.cpp
  lib/Target/AArch64/AArch64TargetMachine.h
  lib/Target/ARM/ARMTargetMachine.cpp
  lib/Target/ARM/ARMTargetMachine.h
  lib/Target/BPF/BPFTargetMachine.cpp
  lib/Target/BPF/BPFTargetMachine.h
  lib/Target/CppBackend/CPPTargetMachine.h
  lib/Target/Hexagon/HexagonTargetMachine.cpp
  lib/Target/Hexagon/HexagonTargetMachine.h
  lib/Target/MSP430/MSP430TargetMachine.cpp
  lib/Target/MSP430/MSP430TargetMachine.h
  lib/Target/Mips/MipsTargetMachine.cpp
  lib/Target/Mips/MipsTargetMachine.h
  lib/Target/NVPTX/NVPTXTargetMachine.cpp
  lib/Target/NVPTX/NVPTXTargetMachine.h
  lib/Target/PowerPC/PPCTargetMachine.cpp
  lib/Target/PowerPC/PPCTargetMachine.h
  lib/Target/R600/AMDGPUTargetMachine.cpp
  lib/Target/R600/AMDGPUTargetMachine.h
  lib/Target/Sparc/SparcTargetMachine.cpp
  lib/Target/Sparc/SparcTargetMachine.h
  lib/Target/SystemZ/SystemZTargetMachine.cpp
  lib/Target/SystemZ/SystemZTargetMachine.h
  lib/Target/TargetMachine.cpp
  lib/Target/X86/X86TargetMachine.cpp
  lib/Target/X86/X86TargetMachine.h
  lib/Target/XCore/XCoreTargetMachine.cpp
  lib/Target/XCore/XCoreTargetMachine.h

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