f43ee18e98
In preparation for updating DIL to handle assignments, this adds a member variable to the DIL Interpreter indicating whether or not updating program variables is allowed. For invocations from the LLDB command prompt (through "frame variable") we want to allow it, but from other places we might not. Therefore we also add new StackFrame ExpressionPathOption, eExpressionPathOptionsAllowVarUpdates, which we add to calls from CommandObjectFrame, and which is checked in GetValueForVariableExpressionPath. Finally, we also add a parameter, can_update_vars, with a default value of true, to ValueObject::SetValueFromInteger, as that will be the main function used to by assignment in DIL.
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