x86-64: remove unnecessary spill/reload of rbx from memcpy
Impact: micro-optimization This should slightly improve its performance. Signed-off-by: Jan Beulich <jbeulich@novell.com> LKML-Reference: <49B8F641.76E4.0078.0@novell.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
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