[perf] Fixed PerfWatson in Mono.Debugger.Soft.Connection.disconnected_check #417
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With another recent PerfWatson fix (824fc62), a lock has been introduced in the disconnected_check method, to mostly control the access of the disconnected property. This caused a new PerfWatson issue, so this change reverts that extra threading control and instead converts the disconnected boolean variable into a volatile variable, so the latest updated value is always guaranteed for multi threading access, without the need of an unnecessary and blocking lock.
Fixes https://devdiv.visualstudio.com/DevDiv/_workitems/edit/2481686/?view=edit