[Bug rtl-optimization/124041] [16 regression] ICE in lra_eliminate_regs_1, at lra-eliminations.cc:665 since r16-1565

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=124041

--- Comment #8 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
```
(insn 36 34 38 3 (set (reg:SI 21 x21 [orig:109 _26 ] [109])
        (reg:SI 31 sp)) "/app/example.cpp":10:16 69 {*movsi_aarch64}
     (nil))
```

Was accepted in GCC 15. 

But that is invalid according to aarch64_hard_regno_mode_ok:
  if (regno == SP_REGNUM)
    /* The purpose of comparing with ptr_mode is to support the
       global register variable associated with the stack pointer
       register via the syntax of asm ("wsp") in ILP32.  */
    return mode == Pmode || mode == ptr_mode;