Make Array.size() a function instead of a property

Also add a deprecated extension property to help migration. This is done to
unify getting size of arrays and collections

generators/src/org/jetbrains/jet/generators/builtins/arrayIterators.kt

@@ -28,7 +28,7 @@ class GenerateArrayIterators(out: PrintWriter) : BuiltInsSourceGenerator(out) {
             val s = kind.capitalized
             out.println("private class Array${s}Iterator(private val array: ${s}Array) : ${s}Iterator() {")
             out.println("    private var index = 0")
-            out.println("    override fun hasNext() = index < array.size")
+            out.println("    override fun hasNext() = index < array.size()")
             out.println("    override fun next$s() = array[index++]")
             out.println("}")
             out.println()

generators/src/org/jetbrains/jet/generators/builtins/arrays.kt

@@ -26,10 +26,12 @@ class GenerateArrays(out: PrintWriter) : BuiltInsSourceGenerator(out) {
     override fun generateBody() {
         for (kind in PrimitiveType.values()) {
             val s = kind.capitalized
-            out.println("public class ${s}Array(public val size: Int) : Cloneable {")
+            out.println("public class ${s}Array(size: Int) : Cloneable {")
             out.println("    public fun get(index: Int): $s")
             out.println("    public fun set(index: Int, value: $s): Unit")
             out.println()
+            out.println("    public fun size(): Int")
+            out.println()
             out.println("    public fun iterator(): ${s}Iterator")
             out.println()
             out.println("    public val indices: IntRange")