protected void addPrimaryHighlight(ClangToken token, Color highlightColor) {
		addPrimaryHighlights(Set.of(token), highlightColor);
	}
Adds the given secondary highlighter, but does not create any highlights.  All secondary
highlighters pertain to a given function.
@param function the function
@param highlighter the highlighter
Ghidra/Features/Decompiler/src/main/java/ghidra/app/decompiler/component/ClangHighlightController.java