@Override
	public int getReferenceSourceCount() {
		return fromAdapter.getRecordCount();
	}
Attempts to determine the set of references which refer to the specified variable.
In utilizing the firstUseOffset scoping model, negative offsets (relative to the functions
entry) are shifted beyond the maximum positive offset within the function.  While this does not account for the
actual instruction flow, it is hopefully accurate enough for most situations.
@see ghidra.program.model.symbol.ReferenceManager#getReferencesTo(ghidra.program.model.listing.Variable)
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/database/references/ReferenceDBManager.java