x86: xen: insn: Decode Xen and KVM emulate-prefix signature

Decode Xen and KVM's emulate-prefix signature by x86 insn decoder.
It is called "prefix" but actually not x86 instruction prefix, so
this adds insn.emulate_prefix_size field instead of reusing
insn.prefixes.

If x86 decoder finds a special sequence of instructions of
XEN_EMULATE_PREFIX and 'ud2a; .ascii "kvm"', it just counts the
length, set insn.emulate_prefix_size and fold it with the next
instruction. In other words, the signature and the next instruction
is treated as a single instruction.

Signed-off-by: Masami Hiramatsu <[email protected]>
Signed-off-by: Peter Zijlstra (Intel) <[email protected]>
Acked-by: Josh Poimboeuf <[email protected]>
Cc: Juergen Gross <[email protected]>
Cc: [email protected]
Cc: Boris Ostrovsky <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Stefano Stabellini <[email protected]>
Cc: Andrew Cooper <[email protected]>
Cc: Borislav Petkov <[email protected]>
Cc: [email protected]
Cc: Randy Dunlap <[email protected]>
Link: https://lkml.kernel.org/r/156777564986.25081.4964537658500952557.stgit@devnote2

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