You will also need the following (untested) patch that prevents
allocation of MMX registers with TARGET_MMX_WITH_SSE in several insn
patterns.

2019-02-14  Uroš Bizjak  <ubizjak@gmail.com>

    PR target/89021
    * config/i386/i386.md (*zero_extendsidi2): Add mmx_isa attribute.
    * config/i386/sse.md (*vec_concatv2sf_sse4_1): Ditto.
    (*vec_concatv2sf_sse): Ditto.
    (*vec_concatv2si_sse4_1): Ditto.
    (*vec_concatv2si): Ditto.
    (*vec_concatv4si_0): Ditto.
    (*vec_concatv2di_0): Ditto.

Uros.