Implement set trap for proxies, and revamp class hierarchy in preparation

src/ia32/macro-assembler-ia32.cc

Index: src/ia32/macro-assembler-ia32.cc
diff --git a/src/ia32/macro-assembler-ia32.cc b/src/ia32/macro-assembler-ia32.cc
index 047236f43d8f3bd324b80c70e4f01584ed26d574..8668fb33e03d970ae768f1d42014a721294347c5 100644
--- a/src/ia32/macro-assembler-ia32.cc
+++ b/src/ia32/macro-assembler-ia32.cc
@@ -330,8 +330,8 @@ void MacroAssembler::IsInstanceJSObjectType(Register map,
                                             Register scratch,
                                             Label* fail) {
   movzx_b(scratch, FieldOperand(map, Map::kInstanceTypeOffset));
-  sub(Operand(scratch), Immediate(FIRST_JS_OBJECT_TYPE));
-  cmp(scratch, LAST_JS_OBJECT_TYPE - FIRST_JS_OBJECT_TYPE);
+  sub(Operand(scratch), Immediate(FIRST_OBJECT_CLASS_TYPE));
+  cmp(scratch, LAST_OBJECT_CLASS_TYPE - FIRST_OBJECT_CLASS_TYPE);
   j(above, fail);
 }