LShift constructor
Calculates the value of in_ shifted left by shiftAmount.
shiftAmount can be either a Logic or a constant be processable by
LogicValue.of.
Implementation
LShift(Logic in_, dynamic shiftAmount, {String name = 'lshift'})
: super((a, shamt) => a << shamt, '<<', in_, shiftAmount,
name: name, outputSvWidthExpansion: true);