https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118501
--- Comment #13 from Matthias Klose <doko at gcc dot gnu.org> ---
the backport requires some more work:
../../src/gcc/config/aarch64/aarch64.md:7255:13: error: 'force_lowpart_subreg'
was not declared in this scope; did you mean 'lowpart_subreg'?
7255 | rtx op1 = force_lowpart_subreg (<VCONQ>mode, operands[1],
<MODE>mode);
| ^~~~~~~~~~~~~~~~~~~~
| lowpart_subreg
