[PATCH] Change TargetLoweringObjectFile ownership

[Aditya Nandakumar]

This patch changes the ownership of TLOF from TargetLoweringBase to TargetMachine so that different subtargets could share the TLOF effectively.
I have made the change to X86 only currently and it passes make check. I could update the other targets after feedback.

Please review.

Thanks
Aditya

http://reviews.llvm.org/D5850

Files:
  include/llvm/Target/TargetLowering.h
  lib/CodeGen/TargetLoweringBase.cpp
  lib/Target/X86/X86ISelLowering.cpp
  lib/Target/X86/X86TargetMachine.cpp
  lib/Target/X86/X86TargetMachine.h
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