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Commit 76a86d3d authored by Andrew Trick's avatar Andrew Trick
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[regcoalescing] bug fix for RegistersDefinedFromSameValue. 

An improper SlotIndex->VNInfo lookup was leading to unsafe copy removal.
Fixes PR10920 401.bzip2 miscompile with no IV rewrite.

llvm-svn: 139765
parent 31412642
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