[gcc r14-9037] c++: Add testcase for this PR [PR97990]

[Andrew Pinski <pinskia@gcc.gnu.org>]

https://gcc.gnu.org/g:5f1438db419c9eb8901d1d1d7f98fb69082aec8e

commit r14-9037-g5f1438db419c9eb8901d1d1d7f98fb69082aec8e
Author: Andrew Pinski <quic_apinski@quicinc.com>
Date:   Fri Feb 16 10:55:43 2024 -0800

    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>

Diff:
---
 gcc/testsuite/g++.dg/torture/vector-struct-1.C | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/gcc/testsuite/g++.dg/torture/vector-struct-1.C b/gcc/testsuite/g++.dg/torture/vector-struct-1.C
new file mode 100644
index 000000000000..e2747417e2d5
--- /dev/null
+++ b/gcc/testsuite/g++.dg/torture/vector-struct-1.C
@@ -0,0 +1,18 @@
+/* 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{});
+}