JS: Provide MIN_VALUE and MAX_VALUE member constants for Int, Long, Short and Byte companion objects.

JVM: Make MIN_VALUE and MAX_VALUE not an extension but member constant properties of Int, Long, Short and Byte companion objects.

core/builtins/native/kotlin/Primitives.kt

@@ -23,7 +23,7 @@ package kotlin
  * On the JVM, non-nullable values of this type are represented as values of the primitive type `byte`.
  */
 public class Byte private () : Number, Comparable<Byte> {
-    companion object {}
+    companion object : IntegerConstants<Byte> {}
 
 /**
  * Compares this value with the specified value for order.
@@ -326,7 +326,7 @@ public class Char private () : Comparable<Char> {
  * On the JVM, non-nullable values of this type are represented as values of the primitive type `short`.
  */
 public class Short private () : Number, Comparable<Short> {
-    companion object {}
+    companion object : IntegerConstants<Short> {}
 
 /**
  * Compares this value with the specified value for order.
@@ -484,7 +484,7 @@ public class Short private () : Number, Comparable<Short> {
  * On the JVM, non-nullable values of this type are represented as values of the primitive type `int`.
  */
 public class Int private () : Number, Comparable<Int> {
-    companion object {}
+    companion object : IntegerConstants<Int> {}
 
 /**
  * Compares this value with the specified value for order.
@@ -657,7 +657,7 @@ public class Int private () : Number, Comparable<Int> {
  * On the JVM, non-nullable values of this type are represented as values of the primitive type `long`.
  */
 public class Long private () : Number, Comparable<Long> {
-    companion object {}
+    companion object : IntegerConstants<Long> {}
 
 /**
  * Compares this value with the specified value for order.

core/builtins/src/kotlin/FloatingPointConstants.kt

@@ -17,7 +17,7 @@
 package kotlin
 
 /**
- * Holder for special values of floating point types.
+ * An interface implemented by companion objects of floating-point types.
  */
 public interface FloatingPointConstants<T> {
     /**

core/builtins/src/kotlin/IntegerConstants.kt

@@ -0,0 +1,32 @@
+/*
+ * Copyright 2010-2015 JetBrains s.r.o.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package kotlin
+
+/**
+ * An interface implemented by companion objects of integral types.
+ */
+public interface IntegerConstants<T> {
+    /**
+     * A constant holding the minimum value an instance of [T] can have.
+     */
+    public val MIN_VALUE: T
+
+    /**
+     * A constant holding the maximum value an instance of [T] can have.
+     */
+    public val MAX_VALUE: T
+}