[RVC] Fix assembling of register values in compressed instructions

[mortbopet]

Currently, any register can be passed to compressed instructions and the instruction will assemble successfully - this is an error; only a subset of the registers can be referenced in the compressed instructions.
This should be caught by the Register class itself when it's trying to write a value that is larger than the bitrange which has been assigned to that register. Currently, any value can be returned from m_isa->regNumber(regToken, success); and applied successfully:

Ripes/src/assembler/instruction.h

Lines 143 to 148 in 9a708c2

	const unsigned reg = m_isa->regNumber(regToken, success);
	if (!success) {
	return Error(line.sourceLine, "Unknown register '" + regToken + "'");
	}
	instruction |= m_range.apply(reg);
	return std::nullopt;

This "might" be an issue with the BitRange itself given that it doesn't check whether a value is wider than its mask:
https://github.com/mortbopet/Ripes/blob/master/src/assembler/instruction.h#L30

[mortbopet]

fixed by 4330e57.