Refactored tests using Array constructor:

Some moved to tests with stdlib
Some changed to use arrayOfNulls

compiler/testData/codegen/boxWithStdlib/arrays/kt945.kt

@@ -0,0 +1,9 @@
+fun box() : String {
+    val data = Array<Array<Boolean>>(3) { Array<Boolean>(4, {false}) }
+    for(d in data) {
+        if(d.size() != 4) return "fail"
+        for(b in d) if (b) return "fail"
+    }
+
+    return "OK"
+}