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Commit 6e54c908 authored by Jakob Stoklund Olesen's avatar Jakob Stoklund Olesen
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Fix an exotic bug that only showed up in an internal test case. 

SimpleRegisterCoalescing::JoinIntervals() uses CoalescerPair to determine if a
copy is coalescable, and in very rare cases it can return true where LHS is not
live - the coalescable copy can come from an alias of the physreg in LHS.

llvm-svn: 106021
parent 8651121c
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