Matthias Braun bfd9c4a462 PeepholeOpt cleanup/refactor; NFC ...

- Less unnecessary use of `auto`
- Add early `using RegSubRegPair(AndIdx) =` to avoid countless
  `TargetInstrInfo::` qualifications.
- Use references instead of pointers where possible.
- Remove unused parameters.
- Rewrite the CopyRewriter class hierarchy:
   - Pull out uncoalescable copy rewriting functionality into
     PeepholeOptimizer class.
   - Use an abstract base class to make it clear that rewriters are
     independent.
- Remove unnecessary \brief in doxygen comments.
- Remove unused constructor and method from ValueTracker.
- Replace UseAdvancedTracking of ValueTracker with DisableAdvCopyOpt use.

llvm-svn: 322325

2018-01-11 22:59:33 +00:00

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