signal: avoid unconditional siginfo copy in send_signal_locked()

send_signal_locked() unconditionally copies siginfo before the namespace
translation to avoid corrupting a shared siginfo.

Not that I think this can actually hurt performance-wise, just it doesn't
look clean to me; the copy is only needed in the unlikely case when the
translation will actually change something.

Defer it to the two cases where si_pid/si_uid are rewritten, and while at
it add #ifdef's just for completeness.

Link: https://lore.kernel.org/akkaAgNfUby5_3nM@redhat.com
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Reviewed-by: Bradley Morgan <include@grrlz.net>
Cc: Christian Brauner <brauner@kernel.org>
Cc: Eric Biederman <ebiederm@xmission.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

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