[Bug gas/25012] pushq/popq %gs/%fs in .code64 now unsupported

[hjl.tools at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=25012

H.J. Lu <hjl.tools at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2019-09-18
                 CC|                            |jbeulich at suse dot com
     Ever confirmed|0                           |1

--- Comment #1 from H.J. Lu <hjl.tools at gmail dot com> ---
It is caused by

commit 21df382b918888de64749e977f185c4e10a5b838
Author: Jan Beulich <address@hidden>
Date:   Tue Jul 16 09:30:29 2019 +0200

    x86: fold SReg{2,3}

    They're the only exception to there generally being no mix of register
    kinds possible in an insn operand template, and there being two bits per
    operand for their representation is also quite wasteful, considering the
    low number of uses.  Fold both bits and deal with the little bit of
    fallout.

    Also take the liberty and drop dead code trying to set REX_B: No segment
    register has RegRex set on it.

    Additionally I was quite surprised that PUSH/POP with the permitted
    segment registers is not covered by the test cases.  Add the missing
    pieces.

Assembler disallows "popq %fs", but disassembler still display "popq %fs".

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