[Mono.Debugger.Soft] Added methods EndInvokeMethodWithResult to all mirrors
StructMirror also set overrides fields of structure in case InvokeMethod was called with InvokeOptions.ReturnOutThis option set
Merge pull request #1162 from DavidKarlas/endInvokeWithResult

[Mono.Debugger.Soft] Added methods EndInvokeMethodWithResult to all mirrors