Code generation could be more efficient for simple 'repeated' types

[dmondrik]

In many cases a vector is declared on the stack and the data is copied unnecessarily. Examples:

• The input int32 array of values in NiRFmxInstrService::SetAttributeI32Array
• The output float64 array stateVector in NiDAQmxService::GetAnalogPowerUpStates

In at least some cases like this, we should be able to generate code that efficiently:

• For input, gets the pointer to the request buffer's data()
• For output, gets the mutable data and reserves the appropriate size.

AB#2545490