c++: Add testcase for this PR [PR97990]

This testcase was fixed by r14-5934-gf26d68d5d128c8 but we should add
one to make sure it does not regress again.

Committed as obvious after a quick test on the testcase.

	PR c++/97990

gcc/testsuite/ChangeLog:

	* g++.dg/torture/vector-struct-1.C: New test.

Signed-off-by: Andrew Pinski <quic_apinski@quicinc.com>

gcc/testsuite/g++.dg/torture/vector-struct-1.C

+/* PR c++/97990 */
+/* This used to crash with lto and strict aliasing enabled as the
+   vector type variant still had TYPE_ALIAS_SET set on it. */
+
+typedef __attribute__((__vector_size__(sizeof(short)))) short TSimd;
+TSimd hh(int);
+struct y6
+{
+  TSimd VALUE;
+  ~y6();
+};
+template <class T1,class T2>
+auto f2(T1 p1, T2){
+  return hh(p1) <= 0;
+}
+void f1(){
+  f2(0, y6{});
+}