testsuite: add testcase for fixed PR98000

gcc/testsuite/ChangeLog:
	PR ipa/98000
	* g++.dg/ipa/pr98000.C: New test.

gcc/testsuite/g++.dg/ipa/pr98000.C

+/* { dg-do compile { target c++17 } } */
+/* { dg-options "-Og -w" } */
+
+struct {
+  template <typename T> T *operator()(T);
+} hb_addressof;
+template <typename, typename, typename... Ts> static int _hb_cmp_method(Ts...) {
+  return 0;
+}
+template <typename V, typename K>
+inline bool hb_bsearch_impl(K key, V, int compar(void *, void *)) {
+  V p;
+  int __trans_tmp_2 = *hb_addressof(key) = compar(&__trans_tmp_2, p);
+  return false;
+}
+struct hb_array_t {
+  int arrayZ;
+};
+struct hb_sorted_array_t : hb_array_t {
+  void bsearch() {
+    hb_bsearch_impl(bsearch_impl_x, &arrayZ, _hb_cmp_method<int, int>);
+  }
+  int bsearch_impl_x;
+};
+template <typename Returned> struct hb_lazy_loader_t {
+  Returned *operator->();
+};
+namespace OT {
+struct COLR;
+}
+struct hb_ot_face_t {
+  hb_lazy_loader_t<OT::COLR> COLR;
+};
+struct {
+  hb_ot_face_t table;
+} hb_ot_color_glyph_get_layers_face;
+namespace OT {
+struct IntType {
+  typedef int wide_type;
+  operator wide_type();
+};
+struct UnsizedArrayOf;
+struct OffsetTo {
+  template <typename Base> friend UnsizedArrayOf operator+(Base, OffsetTo);
+};
+template <typename, bool> using LOffsetTo = OffsetTo;
+template <typename Type> using LNNOffsetTo = LOffsetTo<Type, false>;
+struct UnsizedArrayOf {
+  void as_array(int);
+};
+struct SortedUnsizedArrayOf {
+  hb_sorted_array_t __trans_tmp_4;
+  void bsearch() { __trans_tmp_4.bsearch(); }
+};
+struct COLR {
+  SortedUnsizedArrayOf __trans_tmp_3;
+  int get_glyph_layers() {
+    __trans_tmp_3.bsearch();
+    int __trans_tmp_3 = numLayers;
+    (this + layersZ).as_array(__trans_tmp_3);
+  }
+  LNNOffsetTo<int> layersZ;
+  IntType numLayers;
+};
+} // namespace OT
+void hb_ot_color_glyph_get_layers() {
+  hb_ot_color_glyph_get_layers_face.table.COLR->get_glyph_layers();
+}