GBE: register width should not exceed execution width
GBE: register width should not exceed execution width

Signed-off-by: Ruiling Song <286a174c1339c6eff91abc41c3a1012c95030c95@intel.com>
Reviewed-by: "Xing, Homer" <f17cb7083eb6a94c3fb9d8f09ceefa518f721ab2@intel.com>

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