Introduce per-isolate cache for compile time constants

runtime/vm/object_store.h

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef VM_OBJECT_STORE_H_
 #define VM_OBJECT_STORE_H_
 
 #include "vm/object.h"
 
 namespace dart {
@@ skipping 408 matching lines @@
   RawArray* library_load_error_table() const {
     return library_load_error_table_;
   }
   void set_library_load_error_table(const Array& table) {
     library_load_error_table_ = table.raw();
   }
   static intptr_t library_load_error_table_offset() {
     return OFFSET_OF(ObjectStore, library_load_error_table_);
   }
 
+  RawArray* compile_time_constants() const {
+    return compile_time_constants_;
+  }
+  void set_compile_time_constants(const Array& value) {
+    compile_time_constants_ = value.raw();
+  }
+
   // Visit all object pointers.
   void VisitObjectPointers(ObjectPointerVisitor* visitor);
 
   // Called to initialize objects required by the vm but which invoke
   // dart code.  If an error occurs then false is returned and error
   // information is stored in sticky_error().
   bool PreallocateObjects();
 
   void InitKnownObjects();
 
@@ skipping 69 matching lines @@
   RawError* sticky_error_;
   RawContext* empty_context_;
   RawInstance* stack_overflow_;
   RawInstance* out_of_memory_;
   RawUnhandledException* preallocated_unhandled_exception_;
   RawStacktrace* preallocated_stack_trace_;
   RawFunction* lookup_port_handler_;
   RawTypedData* empty_uint32_array_;
   RawFunction* handle_message_function_;
   RawArray* library_load_error_table_;
+  RawArray* compile_time_constants_;
   RawObject** to() {
-    return reinterpret_cast<RawObject**>(&library_load_error_table_);
+    return reinterpret_cast<RawObject**>(&compile_time_constants_);
   }
 
   friend class SnapshotReader;
   friend class VmIsolateSnapshotReader;
 
   DISALLOW_COPY_AND_ASSIGN(ObjectStore);
 };
 
 }  // namespace dart
 
 #endif  // VM_OBJECT_STORE_H_