Implemented *Array.toString() for all arrays

runtime/src/main/kotlin/kotlin/Array.kt

@@ -47,6 +47,10 @@ public final class Array<T> {
         return IteratorImpl(this)
     }
 
+    public override fun toString(): String {
+        return this.joinToString(separator = ", ", prefix = "[", postfix = "]")
+    }
+
     // Konan-specific.
     @SymbolName("Kotlin_Array_getArrayLength")
     external private fun getArrayLength(): Int

runtime/src/main/kotlin/kotlin/Arrays.kt

@@ -64,6 +64,10 @@ public final class ByteArray {
     public operator fun iterator(): ByteIterator {
         return ByteIteratorImpl(this)
     }
+
+    public override fun toString(): String {
+        return this.joinToString(separator = ", ", prefix = "[", postfix = "]")
+    }
 }
 
 // TODO: replace with generics, once implemented.
@@ -116,6 +120,10 @@ public final class CharArray {
     public operator fun iterator(): kotlin.collections.CharIterator {
         return CharIteratorImpl(this)
     }
+
+    public override fun toString(): String {
+        return this.joinToString(separator = ", ", prefix = "[", postfix = "]")
+    }
 }
 
 private class CharIteratorImpl(val collection: CharArray) : CharIterator() {
@@ -167,6 +175,10 @@ public final class ShortArray {
     public operator fun iterator(): kotlin.collections.ShortIterator {
         return ShortIteratorImpl(this)
     }
+
+    public override fun toString(): String {
+        return this.joinToString(separator = ", ", prefix = "[", postfix = "]")
+    }
 }
 
 private class ShortIteratorImpl(val collection: ShortArray) : ShortIterator() {
@@ -218,6 +230,10 @@ public final class IntArray {
     public operator fun iterator(): kotlin.collections.IntIterator {
         return IntIteratorImpl(this)
     }
+
+    public override fun toString(): String {
+        return this.joinToString(separator = ", ", prefix = "[", postfix = "]")
+    }
 }
 
 private class IntIteratorImpl(val collection: IntArray) : IntIterator() {
@@ -269,6 +285,10 @@ public final class LongArray {
     public operator fun iterator(): kotlin.collections.LongIterator {
         return LongIteratorImpl(this)
     }
+
+    public override fun toString(): String {
+        return this.joinToString(separator = ", ", prefix = "[", postfix = "]")
+    }
 }
 
 private class LongIteratorImpl(val collection: LongArray) : LongIterator() {
@@ -320,6 +340,10 @@ public final class FloatArray {
     public operator fun iterator(): kotlin.collections.FloatIterator {
         return FloatIteratorImpl(this)
     }
+
+    public override fun toString(): String {
+        return this.joinToString(separator = ", ", prefix = "[", postfix = "]")
+    }
 }
 
 private class FloatIteratorImpl(val collection: FloatArray) : FloatIterator() {
@@ -367,6 +391,10 @@ public final class DoubleArray {
     public operator fun iterator(): kotlin.collections.DoubleIterator {
         return DoubleIteratorImpl(this)
     }
+
+    public override fun toString(): String {
+        return this.joinToString(separator = ", ", prefix = "[", postfix = "]")
+    }
 }
 
 private class DoubleIteratorImpl(val collection: DoubleArray) : DoubleIterator() {
@@ -414,6 +442,10 @@ public final class BooleanArray {
     public operator fun iterator(): kotlin.collections.BooleanIterator {
         return BooleanIteratorImpl(this)
     }
+
+    public override fun toString(): String {
+        return this.joinToString(separator = ", ", prefix = "[", postfix = "]")
+    }
 }
 
 private class BooleanIteratorImpl(val collection: BooleanArray) : BooleanIterator() {