Discriminate header classes in favor of non-header type aliases

In the test case, the problem was that Foo.a's type was resolved to the
_class A_, which was written to metadata on JVM instead of the class
AImpl with typealias A as an abbreviation. This metadata was incorrect
because there's no class A from the JVM compiler's point of view; that's
why the error "cannot access class A" was reported

 #KT-19151 Fixed

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

@@ -155,6 +155,12 @@ public class MultiPlatformIntegrationTestGenerated extends AbstractMultiPlatform
             KotlinTestUtils.assertAllTestsPresentByMetadata(this.getClass(), new File("compiler/testData/multiplatform/implTypeAlias"), Pattern.compile("^([^\\.]+)$"), TargetBackend.ANY, true);
         }
 
+        @TestMetadata("discriminateHeaderClassInFavorOfTypeAlias")
+        public void testDiscriminateHeaderClassInFavorOfTypeAlias() throws Exception {
+            String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/multiplatform/implTypeAlias/discriminateHeaderClassInFavorOfTypeAlias/");
+            doTest(fileName);
+        }
+
         @TestMetadata("generic")
         public void testGeneric() throws Exception {
             String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/multiplatform/implTypeAlias/generic/");