Reduced from blender SPEC2017 benchmark:

$ cat space_graph.i
typedef struct {
  float xmin, xmax;
} rctf;

typedef struct {
  rctf tot;
} View2D;

View2D graph_main_area_draw_v2d;

void get_graph_keyframe_extents();

void
graph_main_area_draw() {
  get_graph_keyframe_extents();
  graph_main_area_draw_v2d.tot.xmin -= 10.0f;
  graph_main_area_draw_v2d.tot.xmax += 10.0f;
}

$ gcc -O3 space_graph.i -c
space_graph.i: In function 'graph_main_area_draw':
space_graph.i:14:1: error: definition in block 2 follows the use
   14 | graph_main_area_draw() {
      | ^~~~~~~~~~~~~~~~~~~~
for SSA_NAME: vect__1.5_9 in statement:
vect__4.7_12 = vect__1.5_9 + vect_cst__10;
during GIMPLE pass: slp
space_graph.i:14:1: internal compiler error: verify_ssa failed
0xfcee12 verify_ssa(bool, bool)
	/home/marxin/Programming/gcc/gcc/tree-ssa.c:1208
0xce0a45 execute_function_todo
	/home/marxin/Programming/gcc/gcc/passes.c:1992
0xce178c do_per_function
	/home/marxin/Programming/gcc/gcc/passes.c:1640
0xce178c execute_todo
	/home/marxin/Programming/gcc/gcc/passes.c:2039
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.