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

[hjl.tools at gmail dot com]

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

--- Comment #3 from H.J. Lu <hjl.tools at gmail dot com> ---
I updated users/hjl/optimize branch for

        andq    imm31, mem
        testq   imm31, mem

We need to keep

        andq    imm31, mem

and optimize testq to

        testl   imm31, mem

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