runtime,runtime/pprof: clean up goroutine leak profile collection #121
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Cleaned up goroutine leak profile extraction, by removing the acquisition of goroutineProfile semaphore, and inlining the call to saveg when recording stacks; former use of doRecordGoroutineProfile had side-effects over goroutineProfile fields.
Added regression tests for goroutine leak profiling frontend.
Added stress tests for concurrent goroutine and goroutine leak profile requests.
🔄 This is a mirror of upstream PR golang#76045