Merging r346203:

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r346203 | matze | 2018-11-05 19:15:22 -0800 (Mon, 05 Nov 2018) | 7 lines

AArch64: Cleanup CCMP code; NFC

Cleanup CCMP pattern matching code in preparation for review/bugfix:
- Rename `isConjunctionDisjunctionTree()` to `canEmitConjunction()`
  (it won't accept arbitrary disjunctions and is really about whether we
   can transform the subtree into a conjunction that we can emit).
- Rename `emitConjunctionDisjunctionTree()` to `emitConjunction()`
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llvm-svn: 348636