Report obsolete labels syntax deprecation on objects

#KT-7771 Fixed

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

@@ -234,6 +234,7 @@ public class DeclarationsChecker {
         }
     }
     private void checkObject(JetObjectDeclaration declaration, ClassDescriptor classDescriptor) {
+        AnnotationResolver.reportDeprecatedAnnotationSyntax(declaration.getAnnotations(), trace);
         reportErrorIfHasIllegalModifier(declaration);
         if  (declaration.isLocal() && !declaration.isCompanion() && !declaration.isObjectLiteral()) {
             trace.report(LOCAL_OBJECT_NOT_ALLOWED.on(declaration, classDescriptor));

compiler/testData/diagnostics/tests/annotations/bracketsDeprecation.kt

@@ -23,10 +23,20 @@ fun bar2(): Array<Q> = null!!
 
     fun x(): <!DEPRECATED_ANNOTATION_SYNTAX!>[Ann]<!> String {
         <!DEPRECATED_ANNOTATION_SYNTAX!>[Ann]<!> val x: <!DEPRECATED_ANNOTATION_SYNTAX!>[Ann]<!> String = ""
+
+        val localVal = <!DEPRECATED_ANNOTATION_SYNTAX!>[Ann]<!> object {}
+
         return ""
     }
+
+    <!DEPRECATED_ANNOTATION_SYNTAX!>[Ann]<!> object O1 {}
+    <!DEPRECATED_ANNOTATION_SYNTAX!>[Ann]<!> companion object O2 {
+
+    }
 }
 
+<!DEPRECATED_ANNOTATION_SYNTAX!>[Ann]<!> object O3 {}
+
 val y: Array<[<!DEBUG_INFO_MISSING_UNRESOLVED!>Ann<!>] String?> = arrayOfNulls(1)
 val block: ([<!DEBUG_INFO_MISSING_UNRESOLVED!>Ann<!>] x: <!DEPRECATED_ANNOTATION_SYNTAX!>[Ann]<!> String) -> <!DEPRECATED_ANNOTATION_SYNTAX!>[Ann]<!> String = { "" }
 interface B

compiler/testData/diagnostics/tests/annotations/bracketsDeprecation.txt

@@ -14,6 +14,20 @@ Ann() Ann() internal final class A {
     public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
     public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
     internal final fun x(): @[Ann()] kotlin.String
+
+    Ann() internal object O1 {
+        private constructor O1()
+        public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+    }
+
+    Ann() internal companion object O2 {
+        private constructor O2()
+        public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+    }
 }
 
 internal final annotation class Ann : kotlin.Annotation {
@@ -43,6 +57,13 @@ Ann() internal final class MyClass {
     public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
 }
 
+Ann() internal object O3 {
+    private constructor O3()
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
 kotlin.data() internal final class Q {
     public constructor Q(/*0*/ x: kotlin.Int, /*1*/ y: kotlin.Int)
     internal final val x: kotlin.Int

compiler/testData/diagnostics/tests/inner/selfAnnotationForClassObject.kt

@@ -1,6 +1,6 @@
 class Test {
-    [ClassObjectAnnotation]
-    [NestedAnnotation]
+    @ClassObjectAnnotation
+    @NestedAnnotation
     companion object {
         annotation class ClassObjectAnnotation
     }