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Commit 687744d0 authored by Duncan P. N. Exon Smith's avatar Duncan P. N. Exon Smith
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IR: Reduce RAUW traffic in ConstantVector 

Avoid creating a new `ConstantVector` on an RAUW of one of its members.
This reduces RAUW traffic on any containing constant.

This is part of PR20515.

llvm-svn: 215966
parent b11cd6fb
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