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Commit 39a95032 authored by Hal Finkel's avatar Hal Finkel
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BBVectorize: Omit unnecessary entries in PairableInstUsers 

This map is queried only for instructions in pairs of pairable
instructions; so make sure that only pairs of pairable
instructions are added to the map. This gives a 3.5% speedup
on the csa.ll test case from PR15222.

No functionality change intended.

llvm-svn: 174914
parent 08834518
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