3.16 Directive INVOKE in Win64

The 64-bit version of Masm doesn't support INVOKE anymore. JWasm still does, but please be aware of some restrictions:
- in theory, using INVOKE requires the FRAME attribute for PROC. It will work without FRAME, but Win64 SEH won't be happy with it then.

- the default implementation in 64-bit is very simple: for each INVOKE register RSP is reduced by the space required for the arguments, then the call is issued and finally register RSP is restored. To enable a more efficient code generation see OPTION WIN64, INVOKE Stack Space Reservation - this option is not active as default because it virtually requires a certain programming style.

- there is no additional check that the stack is aligned to 16 byte. The PROC's FRAME attribute ensures that the stack is correctly aligned after the prologue is done. However, it's the programmers responsibility that the stack is still aligned when the code generated by INVOKE starts.