Add a new custom LLVM attributes, named IsHighlighted.

Create a new SCC pass:
For each call graph, if any function is marked with the above custom attribute IsHighlighted, then mark all functions in the call graph with the same attribute.
Display all functions that are marked with the custom attribute in a formatted table. Include the full signature of the function in the display, including the parameter names, types and the return type. Also display the size of the function (in number of lines of code) and the name of the source file that contains the function definition.