ELFObjectWriter: Allow one unique symver per symbol
Summary:
Only allow a single unique .symver alias per symbol. This matches the
behavior of gas. I noticed that we ignored multiple mismatched symver
directives looking at https://reviews.llvm.org/D45798
Reviewers: pcc, tejohnson, espindola
Reviewed By: pcc
Subscribers: emaste, arichardson, llvm-commits, kcc
Differential Revision: https://reviews.llvm.org/D45845
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@331078
91177308-0d34-0410-b5e6-
96231b3b80d8
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