[analyzer][NFC] Add a test case to PR 70792 for Issue 59493 and 54533 (#71073)

Following PR #70792 for issue #70464 
Adding test cases for issue #59493 and #54533

Author: Snape3058

clang/test/Analysis/issue-70464.cpp

@@ -66,3 +66,89 @@ struct Derived : Base {
 void entry() { Derived test; }
 
 } // namespace delegate_ctor_call
+
+// Additional test case from issue #59493
+namespace init_list_array {
+
+struct Base {
+  int foox[5];
+};
+
+class Derived1 : public Base {
+public:
+  Derived1() : Base{{1,4,5,3,2}} {
+    // The dereference to this->foox below should be initialized properly.
+    clang_analyzer_dump(this->foox[0]); // expected-warning{{1 S32b}}
+    clang_analyzer_dump(this->foox[1]); // expected-warning{{4 S32b}}
+    clang_analyzer_dump(this->foox[2]); // expected-warning{{5 S32b}}
+    clang_analyzer_dump(this->foox[3]); // expected-warning{{3 S32b}}
+    clang_analyzer_dump(this->foox[4]); // expected-warning{{2 S32b}}
+    clang_analyzer_dump(foox[0]); // expected-warning{{1 S32b}}
+    clang_analyzer_dump(foox[1]); // expected-warning{{4 S32b}}
+    clang_analyzer_dump(foox[2]); // expected-warning{{5 S32b}}
+    clang_analyzer_dump(foox[3]); // expected-warning{{3 S32b}}
+    clang_analyzer_dump(foox[4]); // expected-warning{{2 S32b}}
+  }
+};
+
+void entry1() { Derived1 test; }
+
+class Derived2 : public Base {
+public:
+  Derived2() : Base{{0}} {
+    // The dereference to this->foox below should be initialized properly.
+    clang_analyzer_dump(this->foox[0]); // expected-warning{{0 S32b}}
+    clang_analyzer_dump(this->foox[1]); // expected-warning{{0 S32b}}
+    clang_analyzer_dump(this->foox[2]); // expected-warning{{0 S32b}}
+    clang_analyzer_dump(this->foox[3]); // expected-warning{{0 S32b}}
+    clang_analyzer_dump(this->foox[4]); // expected-warning{{0 S32b}}
+    clang_analyzer_dump(foox[0]); // expected-warning{{0 S32b}}
+    clang_analyzer_dump(foox[1]); // expected-warning{{0 S32b}}
+    clang_analyzer_dump(foox[2]); // expected-warning{{0 S32b}}
+    clang_analyzer_dump(foox[3]); // expected-warning{{0 S32b}}
+    clang_analyzer_dump(foox[4]); // expected-warning{{0 S32b}}
+  }
+};
+
+void entry2() { Derived2 test; }
+
+} // namespace init_list_array
+
+namespace init_list_struct {
+
+struct Base {
+  struct { int a; int b; } foox;
+};
+
+class Derived : public Base {
+public:
+  Derived() : Base{{42, 24}} {
+    // The dereference to this->foox below should be initialized properly.
+    clang_analyzer_dump(this->foox.a); // expected-warning{{42 S32b}}
+    clang_analyzer_dump(this->foox.b); // expected-warning{{24 S32b}}
+    clang_analyzer_dump(foox.a); // expected-warning{{42 S32b}}
+    clang_analyzer_dump(foox.b); // expected-warning{{24 S32b}}
+  }
+};
+
+} // namespace init_list_struct
+
+// Additional test case from issue 54533
+namespace init_list_enum {
+
+struct Base {
+  enum : unsigned char { ZERO = 0, FORTY_TWO = 42 } foox;
+};
+
+class Derived : public Base {
+public:
+  Derived() : Base{FORTY_TWO} {
+    // The dereference to this->foox below should be initialized properly.
+    clang_analyzer_dump(this->foox); // expected-warning{{42 S32b}}
+    clang_analyzer_dump(foox); // expected-warning{{42 S32b}}
+  }
+};
+
+void entry() { Derived test; }
+
+} // namespace init_list_enum