x86/headers: Unify 'struct _fpstate_ia32' and i386 struct _fpstate

'struct _fpstate_ia32' and 'struct _fpstate' on i386 are
identical in all fields, except 'padding1' being named
'padding'.

We unify the two structures and add a union that is both named
'padding1' and 'padding', in the (unlikely) case there's
user-space code that relies on the padding field name.

We rename the two main types to be:

  struct _fpstate_32
  struct _fpstate_64

for the 32-bit and 64-bit frame, and map them to the main and
compat structure names (_fpstate) depending on whether we are on
32-bit or on 64-bit kernels.

We also keep the old _fpstate_ia32 name as a legacy name.

Acked-by: Mikko Rapeli <mikko.rapeli@iki.fi>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
Link: http://lkml.kernel.org/r/1441438363-9999-8-git-send-email-mingo@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>

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