public boolean setFlag(String registerName, int registerFlag) {
		Register register = registerMap.get(registerName);
		if (register == null) {
			return false;
		}
		register.setFlag(registerFlag);
		return true;
	}
Set a register flag for the specified register
@param registerName register name
@param registerFlag Register defined flag bit(s)
@return true if register was found, else false
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/model/lang/RegisterBuilder.java