[Review] Change TargetLoweringObjectFile ownership

[Aditya Nandakumar]

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Hi All

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

PS: The additional lines which seem like no change are actually due to my editor stripping trailing whitespaces on save. I could disable that if required.