More Robust Function Return Handling - Compiler Programming Ep14

In this video I change the way we handle functions with multiple `return` and in general improve the robustness of the return handling code. I minor annoyance about the lack of the `void` return type is also taken care of now. x64 Function Prolog and Epilog: https://docs.microsoft.com/en-us/cpp/build/prolog-and-epilog?view=vs-2019 JMP instruction encoding: https://www.felixcloutier.com/x86/jmp