x86-urgent-2022-06-19

 - Make RESERVE_BRK() work again with older binutils. The recent
   'simplification' broke that.

 - Make early #VE handling increment RIP when successful.

 - Make the #VE code consistent vs. the RIP adjustments and add comments.

 - Handle load_unaligned_zeropad() across page boundaries correctly in #VE
   when the second page is shared.