[llvm-commits] PATCH: Expose the merge interface for LiveInterval and use it to speed up a few hot paths in LiveIntervalAnalysis

[Chandler Carruth]

Hello,

These two callsites to addRange showed up as fairly hot, taking about 10%
of some executions with many basic blocks and variables.

Exposing the merge interface and using it to batch each loop makes them
vanish from the profile, dropping compilation time on one address sanitizer
test case by 10%.
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