Get rid of 'class object' usages in code and builtins

Replace some comments and library usages as well

compiler/frontend.java/src/org/jetbrains/kotlin/load/java/components/TraceBasedErrorReporter.kt

@@ -30,7 +30,7 @@ import javax.inject.Inject
 
 public class TraceBasedErrorReporter : ErrorReporter {
 
-    class object {
+    companion object {
         private val LOG = Logger.getInstance(javaClass<TraceBasedErrorReporter>())
 
         public val ABI_VERSION_ERRORS: WritableSlice<String, AbiVersionErrorData> = Slices.createCollectiveSlice()

compiler/frontend.java/src/org/jetbrains/kotlin/load/java/structure/impl/annotationArgumentsImpl.kt

@@ -23,7 +23,7 @@ import org.jetbrains.kotlin.name.Name
 abstract class JavaAnnotationArgumentImpl(
         override val name: Name?
 ) : JavaAnnotationArgument {
-    class object Factory {
+    companion object Factory {
         fun create(argument: PsiAnnotationMemberValue, name: Name?): JavaAnnotationArgument {
             val value = JavaPsiFacade.getInstance(argument.getProject()).getConstantEvaluationHelper().computeConstantExpression(argument)
             if (value is Enum<*>) {

compiler/frontend.java/src/org/jetbrains/kotlin/load/kotlin/VirtualFileKotlinClass.kt

@@ -49,7 +49,7 @@ public class VirtualFileKotlinClass private(
     override fun hashCode() = file.hashCode()
     override fun toString() = "${javaClass.getSimpleName()}: $file"
 
-    class object Factory {
+    companion object Factory {
         private val LOG = Logger.getInstance(javaClass<VirtualFileKotlinClass>())
 
         deprecated("Use KotlinBinaryClassCache")

compiler/frontend.java/src/org/jetbrains/kotlin/resolve/jvm/diagnostics/JvmDeclarationOrigin.kt

@@ -47,7 +47,7 @@ public class JvmDeclarationOrigin(
         public val element: PsiElement?,
         public val descriptor: DeclarationDescriptor?
 ) {
-    class object {
+    companion object {
         public val NO_ORIGIN: JvmDeclarationOrigin = JvmDeclarationOrigin(OTHER, null, null)
     }
 }