Add toString() to Any, fix all tests

#KT-4517 Fixed

compiler/testData/codegen/box/classes/kt285.kt

@@ -1,6 +1,6 @@
 trait Trait {
     fun foo() = "O"
-    fun toString() = "K"
+    override fun toString() = "K"
 }
 
 class SimpleClass : Trait

compiler/testData/codegen/box/classes/kt633.kt

@@ -1,5 +1,5 @@
 class mInt(val i : Int) {
-    fun toString() : String = "mint: $i"
+    override fun toString() : String = "mint: $i"
     fun plus(i : Int) = mInt(this.i + i)
     fun inc() = mInt(i + 1)
 }

compiler/testData/codegen/box/finally/finallyAndFinally.kt

@@ -5,7 +5,7 @@ class MyString {
         return this
     }
 
-    fun toString(): String {
+    override fun toString(): String {
         return s
     }
 }

compiler/testData/codegen/box/finally/kt3894.kt

@@ -5,7 +5,7 @@ class MyString {
         return this
     }
 
-    fun toString(): String {
+    override fun toString(): String {
         return s
     }
 }

compiler/testData/codegen/box/finally/loopAndFinally.kt

@@ -7,7 +7,7 @@ class MyString {
         return this
     }
 
-    fun toString(): String {
+    override fun toString(): String {
         return s
     }
 }

compiler/testData/codegen/box/finally/tryLoopTry.kt

@@ -7,7 +7,7 @@ class MyString {
         return this
     }
 
-    fun toString(): String {
+    override fun toString(): String {
         return s
     }
 }

compiler/testData/codegen/box/localClasses/anonymousObjectInInitializer.kt

@@ -3,7 +3,7 @@ class A {
 
     {
         a = object {
-            fun toString(): String = "OK"
+            override fun toString(): String = "OK"
         }.toString()
     }
 }

compiler/testData/codegen/box/localClasses/anonymousObjectInParameterInitializer.kt

@@ -1,6 +1,6 @@
 class A(
         val a: String = object {
-            fun toString(): String = "OK"
+            override fun toString(): String = "OK"
         }.toString()
 )
 

compiler/testData/codegen/box/properties/kt1417.kt

@@ -3,7 +3,7 @@ package pack
 open class A(val value: String )
 
 class B(value: String) : A(value) {
-    fun toString() = "B($value)";
+    override fun toString() = "B($value)";
 }
 
 fun box() = if (B("4").toString() == "B(4)") "OK" else "fail"

compiler/testData/codegen/box/traits/kt2399.kt

@@ -7,7 +7,7 @@ class JsonArray {
 }
 
 class ProjectInfo {
-    public fun toString(): String = "OK"
+    override fun toString(): String = "OK"
 }
 
 public trait Parser<in IN: Any, out OUT: Any> {

compiler/testData/codegen/box/traits/withRequiredPropertyViaBridge.kt

@@ -4,7 +4,7 @@ trait Trait : Base {
     private val value : String
         get() = "OK"
         
-    fun toString() = object {
+    override fun toString() = object {
         fun foo() = value
     }.foo()
 }