[PATCH] Simplify the logic in getX86SubSuperRegister

[Eli Bendersky]

Hello,

getX86SubSuperRegister has a special mode with High=true for i64 which
exists solely to enable it to call itself for i8 with some registers.
The proposed patch simplifies the function somewhat to make the High
bit only meaningful for the i8 mode, which makes sense. No functional
difference (getX86SubSuperRegister is not getting called from anywhere
outside with i64 and High=true).

If this looks OK, I'll also add a comment that documents
getX86SubSuperRegister propertly.

Eli
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