[PATCH] D119962: [ifs] Add --preserve flag for keeping symbols that would be removed by --strip-undefined

[Alex Brachet via Phabricator via llvm-commits]

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There are use-cases of undefined symbols being part of the abi of a library and not it's implementation. In these cases `--strip-undefined` can be used with `--preserve` to keep undefined symbols that are explicitly marked as part of the abi.


https://reviews.llvm.org/D119962

Files:
  llvm/include/llvm/InterfaceStub/IFSHandler.h
  llvm/lib/InterfaceStub/IFSHandler.cpp
  llvm/test/tools/llvm-ifs/preserve.test
  llvm/tools/llvm-ifs/llvm-ifs.cpp

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