Commit113c2e4

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ImportHook: verify __import__ was not updated before overwriting it with original value

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Original file line number	Diff line number	Diff line change
`@@ -61,6 +61,12 @@ static void RestoreImport()`
`61`	`61`	`{`
`62`	`62`	`IntPtrbuiltins=Runtime.GetBuiltins();`
`63`	`63`
	`64`	`+#ifDEBUG`
	`65`	`+IntPtrexisting=Runtime.PyObject_GetAttr(builtins,PyIdentifier.__import__);`
	`66`	`+System.Diagnostics.Debug.Assert(existing==hook.ptr);`
	`67`	`+Runtime.XDecref(existing);`
	`68`	`+#endif`
	`69`	`+`
`64`	`70`	`intres=Runtime.PyObject_SetAttr(builtins,PyIdentifier.__import__,py_import);`
`65`	`71`	`PythonException.ThrowIfIsNotZero(res);`
`66`	`72`	`Runtime.XDecref(py_import);`

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