default -> companion: replace all mentions of default and default object

compiler/testData/resolvedCalls/objectsAndClassObjects/classObject.txt

@@ -1,5 +1,5 @@
 class Foo {
-    default object {
+    companion object {
         val baz = Foo()
     }
 }
@@ -11,8 +11,8 @@ fun test() {
 
 Resolved call:
 
-Resulting descriptor: val baz: Foo defined in Foo.Default
+Resulting descriptor: val baz: Foo defined in Foo.Companion
 
 Explicit receiver kind = DISPATCH_RECEIVER
-Dispatch receiver = Foo {Default}
+Dispatch receiver = Foo {Companion}
 Extension receiver = NO_RECEIVER