shifts and rotates by 1 on ix86

[Alexander Sokolov]

It seems that gas (2.9.5.0.41) always uses the form with immediate for 
encoding shifts and rotates by immediate count, even if the count is 1
where special form of encoding could be used which is 1 byte shorter
(e.g. shll $1,%eax could be encoded as D1 E0, but gas outputs C1 E0 01).
I think gas should always produce the shortest possible encodings.

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Alexander Sokolov
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