VK_SABS is part of the SymLoc bitfield in the variant kind which should
be compared for equality, not by checking the VK_SABS bit.
As far as I know, the existing code happened to produce the correct
results in all cases, so this is just a cleanup.
Patch by Stephen Crane.
Differential Revision: https://reviews.llvm.org/D60596
llvm-svn: 358788
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