reven2.preview.prototypes.calling_conventions.ms64

Implementation of the Microsoft x64 calling convention used by Windows 64bit

https://docs.microsoft.com/en-us/cpp/build/x64-calling-convention?view=msvc-160

``` func3(int a, double b, int c, float d, int e, float f); // a in RCX, b in XMM1, c in R8, d in XMM3, f then e pushed on stack ```

Implementation satus:

• return and arguments of size greater than 64bit are not supported