[Bug target/69551] Wrong code with single element vector insert

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69551

--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
         if (SSE2)
 ....
         else
          /* For SSE1, we have to reuse the V4SF code.  */
          rtx t = gen_reg_rtx (V4SFmode);
          ix86_expand_vector_set (false, t, gen_lowpart (SFmode, val), elt);
          emit_move_insn (target, gen_lowpart (mode, t));

somehow ends up recursing in a weird way, using the new reg t but nowhere
using 'target' apart from overwriting it in the end