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

compiler/testData/codegen/box/arrays/kt2997.kt

@@ -6,55 +6,55 @@ fun foo(a: Any): Int {
         a.set(0, 1)
         a.iterator()
         a.indices
-        return a.size
+        return a.size()
     }
     if (a is ShortArray) {
         a.get(0)
         a.set(0, 1)
         a.iterator()
         a.indices
-        return a.size
+        return a.size()
     }
     if (a is ByteArray) {
         a.get(0)
         a.set(0, 1)
         a.iterator()
         a.indices
-        return a.size
+        return a.size()
     }
     if (a is FloatArray) {
         a.get(0)
         a.set(0, 1.toFloat())
         a.iterator()
         a.indices
-        return a.size
+        return a.size()
     }
     if (a is DoubleArray) {
         a.get(0)
         a.set(0, 1.0)
         a.iterator()
         a.indices
-        return a.size
+        return a.size()
     }
     if (a is BooleanArray) {
         a.get(0)
         a.set(0, false)
         a.iterator()
         a.indices
-        return a.size
+        return a.size()
     }
     if (a is CharArray) {
         a.get(0)
         a.set(0, 'a')
         a.iterator()
         a.indices
-        return a.size
+        return a.size()
     }
     if (a is Array<*>) {
-        if (a.size > 0) a.get(0)
+        if (a.size() > 0) a.get(0)
         a.iterator()
         a.indices
-        return a.size
+        return a.size()
     }
 
     return 0

compiler/testData/codegen/box/arrays/kt503.kt

@@ -22,11 +22,8 @@ fun box() : String {
     catch (e : ArrayIndexOutOfBoundsException) {
         // No more tests to process
     }
-    System.out?.println(n)
     return if(n == 2) "OK" else "fail"
 }
 
 fun thirdElementIsThree(a : IntArray) =
-// Problematic code does not compile
-//    a.size >= 3 & a[2] == 3
-    a.size >= 3 && a[2] == 3
+    a.size() >= 3 && a[2] == 3

compiler/testData/codegen/box/arrays/kt779.kt

@@ -1,3 +1,3 @@
-val <T> Array<T>.length : Int get() = this.size
+val <T> Array<T>.length : Int get() = this.size()
 
 fun box() = if(Array(10, {1}).length == 10) "OK" else "fail"