x86-64: Slightly shorten copy_page()
%r13 got saved and restored without ever getting touched, so there's no need to do so. Signed-off-by: Jan Beulich <jbeulich@suse.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Andrew Morton <akpm@linux-foundation.org> Link: http://lkml.kernel.org/r/4F05D9F9020000780006AA0D@nat28.tlf.novell.comSigned-off-by: Ingo Molnar <mingo@elte.hu>
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