public Reference createRegisterReference(String fromAddress, String registerName, int opIndex) {
		return createRegisterReference(fromAddress, RefType.DATA, registerName,
			SourceType.USER_DEFINED, opIndex);
	}
Creates a sting data type instance at the specified address, repeated {@code N} times.

@param addressString address.
@param dt {@link AbstractStringDataType} string type to place at address.
@param n repeat count.
Ghidra/Features/Base/src/main/java/ghidra/program/database/ProgramBuilder.java