[cxx-interop] Add a test for instantiation of a default destructor

This is a follow-up to f56fa41.

rdar://124061505
(cherry picked from commit 34c796d)

Author: egorzhdan

test/Interop/Cxx/class/Inputs/destructors.h

@@ -28,4 +28,16 @@ struct HasNonTrivialImplicitDestructor {
   HasUserProvidedDestructor member;
 };
 
+template <typename T>
+struct TemplatedHasVirtualDestructor {
+  T value;
+  virtual ~TemplatedHasVirtualDestructor() {}
+};
+
+template <typename T>
+struct DerivedTemplatedHasVirtualDestructor : TemplatedHasVirtualDestructor<T> {
+};
+
+using DerivedTemplatedHasVirtualDestructorChar = DerivedTemplatedHasVirtualDestructor<char>;
+
 #endif // TEST_INTEROP_CXX_CLASS_INPUTS_DESTRUCTORS_H

test/Interop/Cxx/class/destructors-templated-irgen.swift

@@ -0,0 +1,9 @@
+// RUN: %target-swiftxx-frontend -emit-ir -I %S/Inputs -validate-tbd-against-ir=none %s | %FileCheck %s
+
+import Destructors
+
+let _ = DerivedTemplatedHasVirtualDestructorChar()
+
+// CHECK: define {{.*}} @{{_ZN36DerivedTemplatedHasVirtualDestructorIcED2Ev|"\?\?1\?\$DerivedTemplatedHasVirtualDestructor@D@@UEAA@XZ"}}
+// CHECK: entry:
+// CHECK:   call {{.*}} @{{_ZN29TemplatedHasVirtualDestructorIcED2Ev|"\?\?1\?\$TemplatedHasVirtualDestructor@D@@UEAA@XZ"}}