Make Array.indices extension property, move to stdlib

This is not something that needs to be intrinsified. Note that compiler
optimizations are still possible and the fact whether 'indices' is a member or
an extension is irrelevant to the optimizer

core/builtins/native/kotlin/Array.kt

@@ -24,7 +24,5 @@ public class Array<reified T>(size: Int, init: (Int) -> T) : Cloneable {
 
     public fun iterator(): Iterator<T>
 
-    public val indices: IntRange
-
     public override fun clone(): Array<T>
 }

core/builtins/native/kotlin/Arrays.kt

@@ -26,8 +26,6 @@ public class ByteArray(size: Int) : Cloneable {
 
     public fun iterator(): ByteIterator
 
-    public val indices: IntRange
-
     public override fun clone(): ByteArray
 }
 
@@ -39,8 +37,6 @@ public class CharArray(size: Int) : Cloneable {
 
     public fun iterator(): CharIterator
 
-    public val indices: IntRange
-
     public override fun clone(): CharArray
 }
 
@@ -52,8 +48,6 @@ public class ShortArray(size: Int) : Cloneable {
 
     public fun iterator(): ShortIterator
 
-    public val indices: IntRange
-
     public override fun clone(): ShortArray
 }
 
@@ -65,8 +59,6 @@ public class IntArray(size: Int) : Cloneable {
 
     public fun iterator(): IntIterator
 
-    public val indices: IntRange
-
     public override fun clone(): IntArray
 }
 
@@ -78,8 +70,6 @@ public class LongArray(size: Int) : Cloneable {
 
     public fun iterator(): LongIterator
 
-    public val indices: IntRange
-
     public override fun clone(): LongArray
 }
 
@@ -91,8 +81,6 @@ public class FloatArray(size: Int) : Cloneable {
 
     public fun iterator(): FloatIterator
 
-    public val indices: IntRange
-
     public override fun clone(): FloatArray
 }
 
@@ -104,8 +92,6 @@ public class DoubleArray(size: Int) : Cloneable {
 
     public fun iterator(): DoubleIterator
 
-    public val indices: IntRange
-
     public override fun clone(): DoubleArray
 }
 
@@ -117,8 +103,6 @@ public class BooleanArray(size: Int) : Cloneable {
 
     public fun iterator(): BooleanIterator
 
-    public val indices: IntRange
-
     public override fun clone(): BooleanArray
 }