Check platform<->impl compatibility for class members

When matching platform and impl classifiers, ensure that each declaration from
the platform class scope is present in the impl class scope.

Note that the presence of the 'impl' modifier is not checked yet

compiler/tests/org/jetbrains/kotlin/multiplatform/MultiPlatformIntegrationTestGenerated.java

@@ -72,6 +72,12 @@ public class MultiPlatformIntegrationTestGenerated extends AbstractMultiPlatform
         doTest(fileName);
     }
 
+    @TestMetadata("incorrectImplInClass")
+    public void testIncorrectImplInClass() throws Exception {
+        String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/multiplatform/incorrectImplInClass/");
+        doTest(fileName);
+    }
+
     @TestMetadata("simple")
     public void testSimple() throws Exception {
         String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/multiplatform/simple/");