ArraySplice builtin should return empty array and not alter receiver if invoked with no arguments.

src/array.js

Index: src/array.js
diff --git a/src/array.js b/src/array.js
index 0d7a7cbc85e1f89a490d229fa759d047b3966fa6..28142bb1600327dc935b60262f60e50e3fac34e8 100644
--- a/src/array.js
+++ b/src/array.js
@@ -603,16 +603,17 @@ function ArraySplice(start, delete_count) {
   }
 
   // SpiderMonkey, TraceMonkey and JSC treat the case where no delete count is
-  // given differently from when an undefined delete count is given.
+  // given as a request to delete all the elements from the start.
+  // And it differs from the case of undefined delete count.
   // This does not follow ECMA-262, but we do the same for
   // compatibility.
   var del_count = 0;
-  if (num_arguments > 1) {
+  if (num_arguments == 1) {
+    del_count = len - start_i;
+  } else {
     del_count = TO_INTEGER(delete_count);
     if (del_count < 0) del_count = 0;
     if (del_count > len - start_i) del_count = len - start_i;
-  } else {
-    del_count = len - start_i;
   }
 
   var deleted_elements = [];