x86/alternative: Align insn bytes vertically

For easier inspection which bytes have changed.

For example:

  feat: 7*32+12, old: (__x86_indirect_thunk_r10+0x0/0x20 (ffffffff81c02480) len: 17), repl: (ffffffff897813aa, len: 17)
  ffffffff81c02480:   old_insn: 41 ff e2 90 90 90 90 90 90 90 90 90 90 90 90 90 90
  ffffffff897813aa:   rpl_insn: e8 07 00 00 00 f3 90 0f ae e8 eb f9 4c 89 14 24 c3
  ffffffff81c02480: final_insn: e8 07 00 00 00 f3 90 0f ae e8 eb f9 4c 89 14 24 c3

No functional changes.

Signed-off-by: Borislav Petkov <bp@suse.de>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20210601193713.16190-1-bp@alien8.de