Bug 22748 – ~this() @nogc { synchronized ...... } liable to onMemoryOperationError

I don't have a minimized example, this came up in the middle of a large work application, but examining the source code and the stack trace reveals the issue. The destructor is @nogc hoping to avoid these, but this slipped through. I'm not sure if it should actually fail the nogc check (though it does fail a nothrow check which is interesting but not necessarily a bug per se), but regardless we should do something. synchronized(this) calls ensureMontior which calls GC.setAttr which throws the invalid memory operation error.

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