Check all modifiers for objects

DeclarationsChecker didn't check visibility modifiers for objects

compiler/frontend/src/org/jetbrains/jet/lang/resolve/DeclarationsChecker.java

@@ -64,7 +64,7 @@ public class DeclarationsChecker {
 
             if (!bodiesResolveContext.completeAnalysisNeeded(objectDeclaration)) continue;
             checkObject(objectDeclaration);
-            modifiersChecker.checkIllegalModalityModifiers(objectDeclaration);
+            modifiersChecker.checkModifiersForDeclaration(objectDeclaration, objectDescriptor);
         }
 
         Map<JetNamedFunction, SimpleFunctionDescriptor> functions = bodiesResolveContext.getFunctions();

compiler/testData/diagnostics/tests/IllegalModifiers.kt

@@ -18,4 +18,7 @@ class FinalClass() {
         <!ILLEGAL_MODIFIER!>open<!> get(): Int = $i
     var j: Int = 1
         <!ILLEGAL_MODIFIER!>open<!> set(v: Int) {}
-}
+}
+
+<!INCOMPATIBLE_MODIFIERS!>private<!> <!INCOMPATIBLE_MODIFIERS!>public<!> class C
+<!INCOMPATIBLE_MODIFIERS!>private<!> <!INCOMPATIBLE_MODIFIERS!>public<!> object D