d8 external array c'tors: allow parameters that can be converted to numbers

test/mjsunit/external-array.js

Index: test/mjsunit/external-array.js
diff --git a/test/mjsunit/external-array.js b/test/mjsunit/external-array.js
index d7e9de0291fc2b4b5af082ed62694e91d9f907f7..81c6cfe8b44fa00d4c73a2d20078f3337149ff24 100644
--- a/test/mjsunit/external-array.js
+++ b/test/mjsunit/external-array.js
@@ -81,6 +81,19 @@ assertEquals(2.5, get(array, 0));
 assertEquals(3.5, get(array, 1));
 }
 
+// Test non-number parameters.
+var array_with_length_from_non_number = new Int32Array("2");
+assertEquals(2, array_with_length_from_non_number.length);
+array_with_length_from_non_number = new Int32Array(undefined);
+assertEquals(0, array_with_length_from_non_number.length);
+var foo = { valueOf: function() { return 3; } };
+array_with_length_from_non_number = new Int32Array(foo);
+assertEquals(3, array_with_length_from_non_number.length);
+foo = { toString: function() { return "4"; } };
+array_with_length_from_non_number = new Int32Array(foo);
+assertEquals(4, array_with_length_from_non_number.length);
+
+
 // Test loads and stores.
 types = [Array, Int8Array, Uint8Array, Int16Array, Uint16Array, Int32Array,
          Uint32Array, PixelArray, Float32Array, Float64Array];