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

compiler/testData/resolve/candidatesPriority/classObjectOuterResolve.resolve

@@ -1,7 +1,7 @@
 fun ~test~test() = 1
 
 class Test {
-    default object {
+    companion object {
         fun call() = `test`test()
     }
 

compiler/testData/resolve/imports/ImportConflictWithClassObject.resolve

@@ -5,7 +5,7 @@ package test
 import testing.TestClass
 
 class WithClassObject {
-  default object {
+  companion object {
     class ~class-object~TestClass
   }
 

compiler/testData/resolve/imports/ImportConflictsWithMappedToJava.resolve

@@ -4,7 +4,7 @@ package test
 
 import testing.custom.*
 
-// Default import has priority over on-demand ones. No conflicts are expected.
+// Companion import has priority over on-demand ones. No conflicts are expected.
 val a1: `kotlin::List`List<Int>? = null
 
 //FILE:javaUtilImport.kt
@@ -13,7 +13,7 @@ package test
 
 import java.util.*
 
-// Default imports take over import-on-demand
+// Companion imports take over import-on-demand
 // TODO: Fix for lazy resolve test
 // val a2: 'kotlin::List'List<Int>? = null
 
@@ -24,7 +24,7 @@ package test
 import testing.custom.*
 import java.util.*
 
-// Default import has priority over on-demand ones. No conflicts are expected.
+// Companion import has priority over on-demand ones. No conflicts are expected.
 val a3: `kotlin::List`List<Int>? = null
 
 //FILE:singleClassImportFromJavaUtil.kt