Matthias Braun f0b68d3fbc SplitKit: Correctly implement partial subregister copies ...

- This fixes a bug where subregister incompatible with the vregs register
  class where used.
- Implement the case where multiple copies are necessary to cover a
  given lanemask.

Differential Revision: https://reviews.llvm.org/D30438

llvm-svn: 298025

2017-03-17 00:41:39 +00:00

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