x86-64: fix handling of PUSH/POP of segment register

x86-64: fix handling of PUSH/POP of segment register

Commit 21df382b91 ("x86: fold SReg{2,3}") went too far: Folding 64-bit
PUSH/POP templates into non-64-bit ones isn't correct, due to the
different operand widths, and hence suffixes permitted. Restore the
separate templates.

Add tests of PUSH/POP with q suffix and %fs/%gs operands to the
testsuite. While doing so also add PUSHF/POPF ones _without_ suffix.

(cherry picked from commit 3f9aad111cea2f25877d0a6b404956769c14faee)