JS: Provide MIN_VALUE and MAX_VALUE member constants for Double and Float companion objects.

JVM: Make MIN_VALUE and MAX_VALUE not an extension but member constant properties of Double and Float companion objects.

core/builtins/src/kotlin/FloatingPointConstants.kt

@@ -20,6 +20,16 @@ package kotlin
  * An interface implemented by companion objects of floating-point types.
  */
 public interface FloatingPointConstants<T> {
+    /**
+     * A constant holding the smallest *positive* nonzero value.
+     */
+    public val MIN_VALUE: T
+
+    /**
+     * A constant holding the largest positive finite value.
+     */
+    public val MAX_VALUE: T
+
     /**
      * A constant holding the positive infinity value.
      */