[Bug gas/22871] Encode instructions of 64-bit operand without the REX_W bit

[hjl.tools at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=22871

--- Comment #22 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to H.J. Lu from comment #15)
> (In reply to Jan Beulich from comment #13)
> > One more pair of cases to consider is conversion of word/dword/qword add/sub
> > with an immediate of 128 to sub/add with -128 as immediate.
> 
> Done on users/hjl/optimize branch.

We can't convert add/sub to sub/add since ELFAGS are different.

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