[Bug c/117145] [14/15 Regression] ICE: in make_ssa_name_fn, at tree-ssanames.cc:355 at -O1 and above with vector_size and VLA in struct argument since r14-1143-g42d1612eb5c3b2

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117145

--- Comment #6 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Note I suspect PR 117245 and this one has the same underlying issue where
C_TYPE_VARIABLY_MODIFIED gets lost after the vector_size recreates the types. 
That is using a typedef for the vector type fixes the issue because we don't
need to recreate the type.

That is doing:
typedef  __attribute__((vector_size(4))) char v4c;

and then using v4c instead of `__attribute__((vector_size(4))) char` works.