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The point of instrumentation-sleep-time option is to have a watcher process which shares memory with all other forks and dumps a common profile each n seconds. Combining it with append-pid suggests that we should get a private profile of each fork every n seconds, but such behavior is not implemented currently and is not easy to implement in general, because we somehow need to intercept each individual fork, launch a watcher process just for that fork, and also map counters so that they're only shared with that single fork. Since we're not doing it, we just disallow such combination of options. Reviewed By: rafauler, Amir Differential Revision: https://reviews.llvm.org/D153771