Move commentary on opcode translation for code16 mov instructions to segment registers closer to the segment register check for when we add further optimizations.
Move commentary on opcode translation for code16 mov instructions
to segment registers closer to the segment register check for when
we add further optimizations.

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@363355 91177308-0d34-0410-b5e6-96231b3b80d8

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