Refactor KClassValue to store ClassLiteralValue internally

Only invariant array projections and non-null element types will be
supported soon (see KT-26568), so it makes no sense to store the
complete type in KClassValue. What we need is only the ClassId of the
class, and the number of times it's wrapped into kotlin/Array, which is
exactly what ClassLiteralValue represents.

This change helps in decoupling annotation values from
descriptors/types. The only constant value that depends on descriptors
is now AnnotationValue.

 #KT-26582 Fixed

compiler/tests/org/jetbrains/kotlin/resolve/annotation/AnnotationDescriptorResolveTest.java

@@ -87,7 +87,7 @@ public class AnnotationDescriptorResolveTest extends AbstractAnnotationDescripto
 
     public void testJavaClassAnnotation() throws Exception {
         String content = getContent("AnnClass(MyClass::class)");
-        String expectedAnnotation = "@AnnClass(a = MyClass::class)";
+        String expectedAnnotation = "@AnnClass(a = test.MyClass::class)";
         doTest(content, expectedAnnotation);
     }
 }