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Commit b752daa2 authored by Simon Pilgrim's avatar Simon Pilgrim
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[InstCombine] Replace getLogBase2 internal helper with ConstantExpr::getExactLogBase2. NFCI. 

This exposes the helper for other power-of-2 instcombine folds that I'm intending to add vector support to.

The helper only operated on power-of-2 constants so getExactLogBase2 is a more accurate name.
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