Bruno Cardoso Lopes f16ec12654 [PeepholeOptimizer] Refactor optimizeUncoalescable logic ...

Reapply r242294.

- Create a new CopyRewriter for Uncoalescable copy-like instructions
- Change the ValueTracker to return a ValueTrackerResult

This makes optimizeUncoalescable looks more like optimizeCoalescable and
use the CopyRewritter infrastructure.

This is also the preparation for looking up into PHI nodes in the
ValueTracker.

rdar://problem/20404526

Differential Revision: http://reviews.llvm.org/D11195

llvm-svn: 242940

2015-07-22 21:30:16 +00:00

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