[PPC][NFC] Add Subtarget and replace all uses of PPCSubTarget with Subtarget.
Summary: In preparation for GlobalISel, PPCSubTarget needs to be renamed to Subtarget as there places in GlobalISel that assume the presence of the variable Subtarget. This patch introduces the variable Subtarget, and replaces all existing uses of PPCSubTarget with Subtarget. A subsequent patch will remove the definiton of PPCSubTarget, once any downstream users have the opportunity to rename any uses they have. Reviewers: hfinkel, nemanjai, jhibbits, #powerpc, echristo, lkail Reviewed By: #powerpc, echristo, lkail Subscribers: echristo, lkail, wuzish, nemanjai, hiraditya, jfb, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D81623
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