x86: cleanup patches

This is random collection of patch for x86.
Mainly each of patch attempts to clean up and increase readability of code.

thanks Akinobu, i've applied the first 6 patches - they are really nice cleanups.

The final 3 look good too but there's a patch conflict here: they were for mpparse_*.c which has just been unified in x86.git. Would you mind to have a look whether they are still relevant to the new mpparse.c? (Note, it's not available yet, will push that tree out later today)

Ingo