add test relaetd to c++20 only

Author: a-tarasyuk

clang/test/Analysis/div-zero-cxx20.cpp

@@ -0,0 +1,52 @@
+// RUN: %clang_analyze_cc1 -analyzer-checker=core.DivideZero -std=c++20 -verify %s
+
+namespace GH148875 {
+struct A {
+  int x;
+  A(int v) : x(v) {}
+};
+
+struct B {
+  int x;
+  B() : x(0) {}
+};
+
+struct C {
+  int x, y;
+  C(int a, int b) : x(a), y(b) {}
+};
+
+struct D {
+  int x;
+};
+
+struct E {
+  D d;
+  E(int a) : d(a) {}
+};
+
+int t1() {
+  A a(42);
+  return 1 / (a.x - 42); // expected-warning {{Division by zero}}
+}
+
+int t2() {
+  B b;
+  return 1 / b.x; // expected-warning {{Division by zero}}
+}
+
+int t3() {
+  C c1(1, -1);
+  return 1 / (c1.x + c1.y); // expected-warning {{Division by zero}}
+}
+
+int t4() {
+  C c2(0, 0);
+  return 1 / (c2.x + c2.y); // expected-warning {{Division by zero}}
+}
+
+int t5() {
+  E e = 32;
+  return 1 / (e.d.x - 32); // expected-warning {{Division by zero}}
+}
+} // namespace GH148875