[Bug tree-optimization/122589] [16 regression] ICE when building kwin with -g3

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=122589

--- Comment #4 from Sam James <sjames at gcc dot gnu.org> ---
```
struct QPointF {
  QPointF(double xpos, double ypos) : xp(xpos), yp(ypos) {}
  double xp;
  double yp;
};
double xp, yp, w, h;
struct QRectF {
  QRectF(QPointF, int);
  QPointF center() { return QPointF(xp + w / 2, yp + h / 2); }
};
void clientArea(QPointF &);
int workspace_size;
void workspace() {
  QRectF geom(QPointF(0, 0), workspace_size);
  xp = 0 - w / 2;
  yp = -h;
  QPointF __trans_tmp_2 = geom.center();
  clientArea(__trans_tmp_2);
}
```

```
$ g++ placement.cpp.ii -c -O2 -g -march=x86-64-v3
during GIMPLE pass: widening_mul
placement.cpp.ii: In function ‘void workspace()’:
placement.cpp.ii:13:6: internal compiler error: in delink_imm_use, at
ssa-iterators.h:285
   13 | void workspace() {
      |      ^~~~~~~~~
```