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MSan adds a constructor to each translation unit that calls __msan_init, and does nothing else. The idea is to run __msan_init before any instrumented code. This results in multiple constructors and multiple .init_array entries in the final binary, one per translation unit. This is absolutely unnecessary; one would be enough. This change moves the constructors to a comdat group in order to drop the extra ones. llvm-svn: 260632
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