Only create arguments-maps in the bootstrapper, remove now obsolete ValueType flag.

src/contexts.h

Index: src/contexts.h
diff --git a/src/contexts.h b/src/contexts.h
index 1ee5a6f89139b50833cba8807a57cb72f0e9f3c7..abb9a97986b9d33b0bde871014f6206c10d91c1e 100644
--- a/src/contexts.h
+++ b/src/contexts.h
@@ -132,12 +132,9 @@ enum BindingFlags {
     strict_function_without_prototype_map) \
   V(BOUND_FUNCTION_MAP_INDEX, Map, bound_function_map) \
   V(REGEXP_RESULT_MAP_INDEX, Map, regexp_result_map)\
-  V(SLOPPY_ARGUMENTS_BOILERPLATE_INDEX, JSObject, \
-    sloppy_arguments_boilerplate) \
-  V(ALIASED_ARGUMENTS_BOILERPLATE_INDEX, JSObject, \
-    aliased_arguments_boilerplate) \
-  V(STRICT_ARGUMENTS_BOILERPLATE_INDEX, JSObject, \
-    strict_arguments_boilerplate) \
+  V(SLOPPY_ARGUMENTS_MAP_INDEX, Map, sloppy_arguments_map) \
+  V(ALIASED_ARGUMENTS_MAP_INDEX, Map, aliased_arguments_map) \
+  V(STRICT_ARGUMENTS_MAP_INDEX, Map, strict_arguments_map) \
   V(MESSAGE_LISTENERS_INDEX, JSObject, message_listeners) \
   V(MAKE_MESSAGE_FUN_INDEX, JSFunction, make_message_fun) \
   V(GET_STACK_TRACE_LINE_INDEX, JSFunction, get_stack_trace_line_fun) \
@@ -263,9 +260,9 @@ class Context: public FixedArray {
     // These slots are only in native contexts.
     GLOBAL_PROXY_INDEX = MIN_CONTEXT_SLOTS,
     SECURITY_TOKEN_INDEX,
-    SLOPPY_ARGUMENTS_BOILERPLATE_INDEX,
-    ALIASED_ARGUMENTS_BOILERPLATE_INDEX,
-    STRICT_ARGUMENTS_BOILERPLATE_INDEX,
+    SLOPPY_ARGUMENTS_MAP_INDEX,
+    ALIASED_ARGUMENTS_MAP_INDEX,
+    STRICT_ARGUMENTS_MAP_INDEX,
     REGEXP_RESULT_MAP_INDEX,
     SLOPPY_FUNCTION_MAP_INDEX,
     SLOPPY_FUNCTION_WITH_READONLY_PROTOTYPE_MAP_INDEX,