more tests

Author: cor3ntin

clang/test/SemaCXX/cxx2a-constexpr-dynalloc.cpp

@@ -249,6 +249,7 @@ struct S {
     constexpr ~S() {
         delete c;
     }
+    int i = 0;
 };
 
 int f() {
@@ -261,6 +262,9 @@ int f() {
     if constexpr(S s; (s, true)) { // expected-warning{{left operand of comma operator has no effect}}
         return 1;
     }
+    if constexpr(constexpr int _ = S{}.i; true) {
+        return 1;
+    }
     return 0;
 }
 }