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Before this change, each module defined a weak_odr global __msan_track_origins with a value of 1 if origin tracking is enabled, 0 if disabled. If there are modules with different values, any of them may win. If 0 wins, and there is at least one module with 1, the program will most likely crash. With this change, __msan_track_origins is only emitted if origin tracking is on. Then runtime library detects if there is at least one module with origin tracking, and enables runtime support for it. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@182997 91177308-0d34-0410-b5e6-96231b3b80d8
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