[Not for commit] Make Array.splice change receiver's FixedArray when significant part is cut.

test/mjsunit/array-splice.js

Index: test/mjsunit/array-splice.js
diff --git a/test/mjsunit/array-splice.js b/test/mjsunit/array-splice.js
index 887097db61c151d82a41ffb11f9b17395954130b..cd851336414d4d707fbc026431b03dc88ea107e1 100644
--- a/test/mjsunit/array-splice.js
+++ b/test/mjsunit/array-splice.js
@@ -218,6 +218,40 @@
 })();
 
 
+// Check behavior on significant part spliced.
+(function() {
+  var array, spliced;
+  for (var i = 0; i < 7; i++) {
+    array = [1, 2, 3, 4, 5, 6, 7];
+    spliced = array.splice(-100, 100, 9);
+    assertEquals([9], array);
+    assertEquals([1, 2, 3, 4, 5, 6, 7], spliced);
+  }
+
+  for (var i = 0; i < 7; i++) {
+    array = [1, 2, 3, 4, 5, 6, 7];
+    spliced = array.splice(0, 6, 9);
+    assertEquals([9, 7], array);
+    assertEquals([1, 2, 3, 4, 5, 6], spliced);
+  }
+
+  for (var i = 0; i < 7; i++) {
+    array = [1, 2, 3, 4, 5, 6, 7];
+    spliced = array.splice(1, 5, 9);
+    assertEquals([1, 9, 7], array);
+    assertEquals([2, 3, 4, 5, 6], spliced);
+  }
+
+  for (var i = 0; i < 7; i++) {
+    array = [1, 2, 3, 4, 5, 6, 7];
+    spliced = array.splice(1, 100, 9);
+    assertEquals([1, 9], array);
+    assertEquals([2, 3, 4, 5, 6, 7], spliced);
+  }
+
+})();
+
+
 // Nasty: modify the array in ToInteger.
 (function() {
   var array = [];