Replace 'class object' with 'default object' in renderers and test data

Includes changes to decompiled text
Old syntax is used in builtins and project code for now

compiler/testData/codegen/boxWithStdlib/annotations/kotlinPropertyFromClassObjectAsParameter.kt

@@ -32,7 +32,7 @@ annotation class Ann(
 )
 
 class Foo {
-    class object {
+    default object {
         val i: Int = 2
         val s: Short = 2
         val f: Float = 2.0.toFloat()

compiler/testData/codegen/boxWithStdlib/annotations/nestedClassPropertyAsParameter.kt

@@ -15,7 +15,7 @@ annotation class Ann(val i: Int)
 
 class A {
    class B {
-      class object {
+      default object {
         val i = 1
       }
    }

compiler/testData/codegen/boxWithStdlib/callableReference/property/kClassInstanceIsInitializedFirst.kt

@@ -1,7 +1,7 @@
 import kotlin.reflect.KMemberProperty
 
 class A {
-    class object {
+    default object {
         val ref: KMemberProperty<A, String> = A::foo
     }
 

compiler/testData/codegen/boxWithStdlib/native/nativePropertyAccessors.kt

@@ -1,5 +1,5 @@
 class C {
-    class object {
+    default object {
         val defaultGetter: Int = 1
             [native] get
 

compiler/testData/codegen/boxWithStdlib/native/privateStatic.kt

@@ -2,7 +2,7 @@ import kotlin.jvm.*
 import kotlin.platform.*
 
 class C {
-    class object {
+    default object {
         private platformStatic native fun foo()
     }
 

compiler/testData/codegen/boxWithStdlib/native/staticNative.kt

@@ -4,7 +4,7 @@ import kotlin.jvm.*
 import kotlin.platform.*
 
 class WithNative {
-    class object {
+    default object {
         platformStatic native fun bar(l: Long, s: String): Double
     }
 }

compiler/testData/codegen/boxWithStdlib/platformStatic/syntheticAccessor.kt

@@ -1,7 +1,7 @@
 import kotlin.platform.*
 
 class C {
-    class object {
+    default object {
         private platformStatic fun foo(): String {
             return "OK"
         }

compiler/testData/codegen/boxWithStdlib/reflection/enclosing/lambdaInClassObject.kt

@@ -1,5 +1,5 @@
 class O {
-    class object {
+    default object {
         // Currently we consider <clinit> in class O as the enclosing method of this lambda,
         // so we write outer class = O and enclosing method = null
         val f = {}

compiler/testData/codegen/boxWithStdlib/reflection/genericSignature/kt5112.kt

@@ -5,13 +5,13 @@ class G<T>(val s: T) {
 }
 
 public trait ErrorsJvmTrait {
-    class object {
+    default object {
         public val param : G<String> = G("STRING")
     }
 }
 
 public class ErrorsJvmClass {
-    class object {
+    default object {
         public val param : G<String> = G("STRING")
     }
 }

compiler/testData/codegen/boxWithStdlib/reflection/genericSignature/kt6106.kt

@@ -6,7 +6,7 @@ open class B
 
 class A {
 
-    class object {
+    default object {
         [platformStatic]
         fun <T: B> a(s: T) : T {
             return s

compiler/testData/codegen/boxWithStdlib/whenEnumOptimization/enumInsideClassObject.kt

@@ -1,7 +1,7 @@
 import kotlin.test.assertEquals
 
 class A {
-    class object {
+    default object {
         enum class Season {
             WINTER
             SPRING