Reorganized file structure

src/arch/x64/Return.go

@@ -1,7 +0,0 @@
-package x64
-
-// Return transfers program control to a return address located on the top of the stack.
-// The address is usually placed on the stack by a Call instruction.
-func Return(code []byte) []byte {
-	return append(code, 0xc3)
-}