[xvm] continue with jit x64
[xvm] initial thoughts about jit...
xbyak will be used as code generator
[xort] optimization in constant arithmetics
[xort] small optimization of the compilation speed.
[xvm] continue with x64 support
fix revert
[xort, xvm] 64 bit version is now supported!
[xvm] continue with 64 bit support
[xvm] initial support of x64 mode