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Commit 269dbd31 authored by Evan Cheng's avatar Evan Cheng
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- Mark last use of a split interval as kill instead of letting spiller track it.

  This allows an important optimization to be re-enabled.
- If all uses / defs of a split interval can be folded, give the interval a
  low spill weight so it would not be picked in case spilling is needed (avoid
  pushing other intervals in the same BB to be spilled).

llvm-svn: 44601
parent bb263018
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