Use a filter instead of a visitor to deoptimize selected functions in a context.

src/objects-inl.h

Index: src/objects-inl.h
diff --git a/src/objects-inl.h b/src/objects-inl.h
index b25af33c77a59d14f2d92a40b422297242c9cc90..9b5438492ede8ce58d7339eebce9e911ce9d6cd2 100644
--- a/src/objects-inl.h
+++ b/src/objects-inl.h
@@ -4796,6 +4796,18 @@ void Code::set_stub_info(int value) {
 }
 
 
+void Code::set_deoptimizing_functions(Object* value) {
+  ASSERT(kind() == OPTIMIZED_FUNCTION);
+  WRITE_FIELD(this, kTypeFeedbackInfoOffset, value);
+}
+
+
+Object* Code::deoptimizing_functions() {
+  ASSERT(kind() == OPTIMIZED_FUNCTION);
+  return Object::cast(READ_FIELD(this, kTypeFeedbackInfoOffset));
+}
+
+
 ACCESSORS(Code, gc_metadata, Object, kGCMetadataOffset)
 INT_ACCESSORS(Code, ic_age, kICAgeOffset)