Imported Upstream version 6.10.0.49

Former-commit-id: 1d6753294b2993e1fbf92de9366bb9544db4189b

external/llvm-project/compiler-rt/test/cfi/vtable-may-alias.cpp

@@ -0,0 +1,25 @@
+// RUN: %clangxx_cfi -o %t %s
+// RUN: %run %t
+
+// In this example, both __typeid_A_global_addr and __typeid_B_global_addr will
+// refer to the same address. Make sure that the compiler does not assume that
+// they do not alias.
+
+struct A {
+  virtual void f() = 0;
+};
+
+struct B : A {
+  virtual void f() {}
+};
+
+__attribute__((weak)) void foo(void *p) {
+  B *b = (B *)p;
+  A *a = (A *)b;
+  a->f();
+}
+
+int main() {
+  B b;
+  foo(&b);
+}