r8-r15 registers to the general purpose registers constant
Their 32-bit, 16-bit & 8-bit counterparts are also included, since even in 64-bit executables, the 8-bit version of a register can still be used to perform operations on this smaller part of a register.
This PR adds:
Their 32-bit, 16-bit & 8-bit counterparts are also included, since even in 64-bit executables, the 8-bit version of a register can still be used to perform operations on this smaller part of a register.