Do not report redeclaration when outer class and default object's members clash

Previously we prohibited classes and properties with the same name (now it's unnecessary)
Add test for backends that they support qualified (by default object name) member references inside class body

compiler/frontend/src/org/jetbrains/kotlin/resolve/DeclarationResolver.kt

@@ -58,24 +58,10 @@ public class DeclarationResolver {
         }
     }
 
-    public fun checkRedeclarationsInInnerClassNames(c: TopDownAnalysisContext) {
+    public fun checkRedeclarations(c: TopDownAnalysisContext) {
         for (classDescriptor in c.getDeclaredClasses().values()) {
-            if (DescriptorUtils.isDefaultObject(classDescriptor)) {
-                // Default objects should be considered during analysing redeclarations in classes
-                continue
-            }
-
-            var allDescriptors = classDescriptor.getScopeForMemberLookup().getOwnDeclaredDescriptors()
-            val defaultObject = classDescriptor.getDefaultObjectDescriptor()
-            if (defaultObject != null) {
-                val descriptorsFromDefaultObject = defaultObject.getScopeForMemberLookup().getOwnDeclaredDescriptors()
-                if (descriptorsFromDefaultObject.isNotEmpty()) {
-                    allDescriptors = allDescriptors + descriptorsFromDefaultObject
-                }
-            }
-
             val descriptorMap = HashMultimap.create<Name, DeclarationDescriptor>()
-            for (desc in allDescriptors) {
+            for (desc in classDescriptor.getScopeForMemberLookup().getOwnDeclaredDescriptors()) {
                 if (desc is ClassDescriptor || desc is PropertyDescriptor) {
                     descriptorMap.put(desc.getName(), desc)
                 }

compiler/frontend/src/org/jetbrains/kotlin/resolve/LazyTopDownAnalyzer.java

@@ -292,7 +292,7 @@ public class LazyTopDownAnalyzer {
         resolveAllHeadersInClasses(c);
 
         declarationResolver.checkRedeclarationsInPackages(topLevelDescriptorProvider, topLevelFqNames);
-        declarationResolver.checkRedeclarationsInInnerClassNames(c);
+        declarationResolver.checkRedeclarations(c);
 
         ResolveUtilPackage.checkTraitRequirements(c.getDeclaredClasses(), trace);