Don't load Object as a supertype for Java classes

#KT-4890 In Progress
 #KT-5002 Fixed

compiler/testData/codegen/box/classes/kt2288.kt

@@ -1,6 +1,6 @@
 public open class Test(): java.util.RandomAccess, Cloneable, java.io.Serializable
 {
-        public override fun clone(): Test = Test() // Override 'clone()' with more precise type 'Test'
+        public fun clone(): Test = Test() // Override 'clone()' with more precise type 'Test'
 
         public override fun toString() = "OK"
 }

compiler/testData/codegen/box/samConstructors/sameWrapperClass.kt

@@ -1,7 +1,7 @@
 fun box(): String {
     val f = { }
-    val class1 = Runnable(f).getClass()
-    val class2 = Runnable(f).getClass()
+    val class1 = (Runnable(f) as Object).getClass()
+    val class2 = (Runnable(f) as Object).getClass()
 
     return if (class1 == class2) "OK" else "$class1 $class2"
-}
+}

compiler/testData/codegen/boxAgainstJava/sam/differentFqNames.kt

@@ -1,7 +1,7 @@
 fun box(): String {
     val f = { }
-    val class1 = Runnable(f).getClass()
-    val class2 = Custom.Runnable(f).getClass()
+    val class1 = Runnable(f).javaClass
+    val class2 = Custom.Runnable(f).javaClass
 
     return if (class1 != class2) "OK" else "Same class: $class1"
 }

compiler/testData/codegen/boxAgainstJava/sam/samConstructorGenericSignature.kt

@@ -2,7 +2,7 @@ import java.util.Arrays
 
 fun box(): String {
     val r: JavaClass.Computable<String> = JavaClass.Computable { "OK" }
-    val supertypes = Arrays.toString(r.getClass().getGenericInterfaces())
+    val supertypes = Arrays.toString(r.javaClass.getGenericInterfaces())
     if (supertypes != "[JavaClass.JavaClass\$Computable<java.lang.String>]") return "Fail: $supertypes"
     return JavaClass.compute(r)!!
 }

compiler/testData/codegen/boxMultiFile/samWrappersDifferentFiles/box.kt

@@ -1,6 +1,6 @@
 fun box(): String {
-    val class1 = getWrapped1().getClass()
-    val class2 = getWrapped2().getClass()
+    val class1 = getWrapped1().javaClass
+    val class2 = getWrapped2().javaClass
 
     return if (class1 != class2) "OK" else "Same class: $class1"
-}
+}

compiler/testData/codegen/boxWithStdlib/dataClasses/kt5002.kt

@@ -0,0 +1,15 @@
+import java.io.Serializable
+
+public data class Pair<out A, out B> (
+        public val first: A,
+        public val second: B
+) : Serializable
+
+fun box(): String {
+    val p = Pair(42, "OK")
+    val q = Pair(42, "OK")
+    if (p != q) return "Fail equals"
+    if (p.hashCode() != q.hashCode()) return "Fail hashCode"
+    if (p.toString() != q.toString()) return "Fail toString"
+    return p.second
+}