Rename Random companion object to Default

#KT-27508

libraries/stdlib/src/kotlin/random/Random.kt

@@ -237,7 +237,7 @@ public abstract class Random {
      *
      * @sample samples.random.Randoms.defaultRandom
      */
-    companion object : Random() {
+    companion object Default : Random() {
 
         private val defaultRandom: Random = defaultPlatformRandom()
 
@@ -262,6 +262,15 @@ public abstract class Random {
         override fun nextBytes(size: Int): ByteArray = defaultRandom.nextBytes(size)
         override fun nextBytes(array: ByteArray, fromIndex: Int, toIndex: Int): ByteArray = defaultRandom.nextBytes(array, fromIndex, toIndex)
 
+        @Deprecated("Use Default companion object instead", level = DeprecationLevel.HIDDEN)
+        @Suppress("DEPRECATION_ERROR")
+        @kotlin.jvm.JvmField
+        public val Companion: Random.Companion = Random.Companion
+    }
+
+    @Deprecated("Use Default companion object instead", level = DeprecationLevel.HIDDEN)
+    public object Companion : Random() {
+        override fun nextBits(bitCount: Int): Int = Default.nextBits(bitCount)
     }
 }
 

libraries/tools/binary-compatibility-validator/reference-public-api/kotlin-stdlib-runtime-merged.txt

@@ -3695,6 +3695,7 @@ public final class kotlin/random/PlatformRandomKt {
 
 public abstract class kotlin/random/Random {
 	public static final field Companion Lkotlin/random/Random$Companion;
+	public static final field Default Lkotlin/random/Random$Default;
 	public fun <init> ()V
 	public abstract fun nextBits (I)I
 	public fun nextBoolean ()Z
@@ -3715,6 +3716,11 @@ public abstract class kotlin/random/Random {
 }
 
 public final class kotlin/random/Random$Companion : kotlin/random/Random {
+	public static final field INSTANCE Lkotlin/random/Random$Companion;
+	public fun nextBits (I)I
+}
+
+public final class kotlin/random/Random$Default : kotlin/random/Random {
 	public fun nextBits (I)I
 	public fun nextBoolean ()Z
 	public fun nextBytes (I)[B