Inline Call to Original Function bytes into 'Swap Space' if it's possible on x86.

[Sewer56]

When calling convention conversion is not needed, you will have

• 5 byte jmp into your function
• 5 byte jmp to original function
• 5-16 bytes stolen from original function

If it happens to be that we stole <= 6 bytes, which may be common in x86, we can safely inline the instructions to call original into the swap space to save 16 bytes of memory.