private boolean isCodeAddress(Address addr) {
		return CODE_SPACE_NAME.equals(addr.getAddressSpace().getName());
	}
Attempt to markup FReg access instruction with register reference.

@param instr
@return register name if identified, else null
Ghidra/Processors/PIC/src/main/java/ghidra/app/plugin/core/analysis/Pic18Analyzer.java