Peter Collingbourne ae03f03be4 Linker: Remove unnecessary call to copyMetadata in IRLinker::linkGlobalVariable.
This was causing us to create duplicate metadata on global variables.
Debug info test case by Adrian Prantl, additional test cases by me.

Fixes PR31012.

Differential Revision: https://reviews.llvm.org/D26622

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@286905 91177308-0d34-0410-b5e6-96231b3b80d8
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