public Register getRegister(String name) {
		return registerNameMap.get(name);
	}
Get register by name. A semi-case-insensitive lookup is performed. The specified name must
match either the case-sensitive name or be entirely lowercase or uppercase.

@param name register name
@return register or null if not found
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/model/lang/RegisterManager.java