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[ThinLTO] Make ValueInfo operator!= consistent with operator== (NFC)

Authored by tejohnson on Jun 6 2018, 11:32 AM.

Description

[ThinLTO] Make ValueInfo operator!= consistent with operator== (NFC)

Compare Ref pointers instead of GUID, to handle comparison with special
empty/tombstone ValueInfo. This was already done for operator==, to
support inserting ValueInfo into DenseMap, but I need the operator!=
side change for upcoming AsmParser summary parsing support.

llvm-svn: 334111

Details