Commit 7b4ff934 authored by Hal Finkel's avatar Hal Finkel
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Move the Metadata merging methods from GVN and make them public in MDNode. 

There are other passes, BBVectorize specifically, that also need some of
this functionality.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@158605 91177308-0d34-0410-b5e6-96231b3b80d8
parent fc9216eb
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