Implement correct checking for inherited readonliness on assignment.

test/test262/test262.status

Index: test/test262/test262.status
diff --git a/test/test262/test262.status b/test/test262/test262.status
index c75528995d874c9c799027e85006ae9935ecd06f..567a78ec847daa24cef66ff1ceea13f575995d2d 100644
--- a/test/test262/test262.status
+++ b/test/test262/test262.status
@@ -39,17 +39,6 @@ S15.12.2_A1: FAIL
 # V8 Bug: http://code.google.com/p/v8/issues/detail?id=691
 11.2.3-3_3: FAIL
 
-# Prototypal inheritance of properties does not maintain accessibility.
-# The [[CanPut]] operation should traverse the prototype chain to
-# determine whether given property is writable or not.
-# V8 Bug: http://code.google.com/p/v8/issues/detail?id=1475
-8.14.4-8-b_1: FAIL
-8.14.4-8-b_2: FAIL
-15.2.3.6-4-405: FAIL
-15.2.3.6-4-410: FAIL
-15.2.3.6-4-415: FAIL
-15.2.3.6-4-420: FAIL
-
 ##################### DELIBERATE INCOMPATIBILITIES #####################
 
 # We deliberately treat arguments to parseInt() with a leading zero as