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Commit f849ace2 authored by Duncan P. N. Exon Smith's avatar Duncan P. N. Exon Smith
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IR: Optimize size of use-list order shuffle vectors 

Since we're storing lots of these, save two-pointers per vector with a
custom type rather than using the relatively heavy `SmallVector`.

Part of PR5680.

llvm-svn: 214135
parent 7385120d
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