const runtime.tracebackCrash

4 uses

	runtime (current package)
		runtime1.go#L20: 	tracebackCrash = 1 << iota
		runtime1.go#L40: 	crash = t&tracebackCrash != 0
		runtime1.go#L418: 		t = 2<<tracebackShift | tracebackAll | tracebackCrash
		runtime1.go#L428: 		t |= tracebackCrash