target-i386: fix xchg rax,r8
We were ignoring REX_B while special-casing NOP, i.e. xchg eax,eax. Signed-off-by: NRichard Henderson <rth@twiddle.net> Signed-off-by: NAurelien Jarno <aurelien@aurel32.net> (cherry picked from commit 7418027e)
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