private static int findIndex(ClangNode group, ClangNode node) {
		for (int i = 0; i < group.numChildren(); ++i) {
			if (group.Child(i) == node) {
				return i;
			}
		}
		return -1;
	}
Update the node stack so that it points to the next ClangToken.  The next token is either
the predecessor or the successor depending on the direction setting (-1 or 1) respectively.
currentToken is set to the next token.  If there is no next token, currentToken is set to null.
Ghidra/Features/Decompiler/src/main/java/ghidra/app/decompiler/TokenIterator.java