Refactor machine operand accessors in EraVMInstrInfo.h so they use logical operands mappings

[akiramenai]

If to set let UseLogicalOperandMappings = true for an instruction, LLVM produces mappings to identify:

• logical operand index -> its size (getLogicalOperandSize)
• logical operand index -> its type (getLogicalOperandType)
• logical operand index -> machine operand index (getLogicalOperandIdx)
  We enable these mappings in [EraVM][CodeEmitter] Emit arithmetics and pointer arithmetics #507.
  In the same time EraVMInstrInfo.h define similar functions: argumentType, argumentSize and functions to calculate iterators to corresponding machine operands. This logic is to be replaced with tablegen generated one.