[cling] Add storage to test types, to trigger dtor call.

interpreter/cling/test/Interfaces/evaluate.C

@@ -78,6 +78,7 @@ V // CHECK-NEXT: (cling::Value &) boxes [(int [2][3][4]) { { { 1, 2, 3, 4 }, { 1
 // Check lifetime of objects in Value
 .rawInput 1
 struct WithDtor {
+   char mem = 0;
    static int fgCount;
    WithDtor() { ++fgCount; }
    WithDtor(const WithDtor&) { ++fgCount; }

interpreter/cling/test/Prompt/ValuePrinter/Destruction.C

@@ -14,7 +14,7 @@
 extern "C" int printf(const char*,...);
 
 class A {
-  int m_A[2];
+  int m_A[2] = 0;
 public:
   A() {}
   ~A() { printf("A::~A()\n"); }
@@ -43,6 +43,7 @@ public:
 int gTest = 0;
 
 class E {
+  char mem = 0;
 public:
   ~E() { gTest = 101; }
 };