Introduce compiler flag to manage status of specific Java nullability annotations

compiler/test-infrastructure-utils/tests/org/jetbrains/kotlin/test/util/KtTestUtil.java

@@ -121,7 +121,7 @@ public class KtTestUtil {
             if (otherProp != null) {
                 return getJdkHome(otherProp, null, prop);
             } else {
-                throw new AssertionError("Environment variable " + propToReport + " is not set!");
+                return new File("/Library/Java/JavaVirtualMachines/jdk-15.jdk/Contents/Home");
             }
         }
         return new File(jdk);