encgen: add more fixed with simd forms. 25.3%
encgen: add more fixed with simd forms. 25.3%

Change-Id: Id4e7a25fca9f215ff9d11da79433bf4a5c90ce7b
(cherry picked from commit 33afcc73497102b0f50f3ff4f113d378324a90d9)

intelxed/xed,intelxed/xed,intelxed/xed,intelxed/xed