Chandler Carruth 4e996de58c Teach the LiveInterval::join function to use the fast merge algorithm, ...

generalizing its implementation sufficiently to support this value
number scenario as well.

This cuts out another significant performance hit in large functions
(over 10k basic blocks, etc), especially those with "natural" CFG
structures.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@160026 91177308-0d34-0410-b5e6-96231b3b80d8

2012-07-10 22:25:21 +00:00

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