Shorter TryAllocate instruction sequence on ARM/ARM64/MIPS.

runtime/vm/heap.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_HEAP_H_
 #define VM_HEAP_H_
 
 #include "platform/assert.h"
 #include "vm/allocation.h"
 #include "vm/flags.h"
@@ skipping 146 matching lines @@
   // Protect access to the heap.
   void WriteProtect(bool read_only);
   void WriteProtectCode(bool read_only) {
     old_space_->WriteProtectCode(read_only);
   }
 
   // Accessors for inlined allocation in generated code.
   uword TopAddress();
   uword EndAddress();
   static intptr_t new_space_offset() { return OFFSET_OF(Heap, new_space_); }
+  uword NewSpaceAddress() const { return reinterpret_cast<uword>(new_space_); }
 
   // Initialize the heap and register it with the isolate.
   static void Init(Isolate* isolate,
                    intptr_t max_new_gen_words,
                    intptr_t max_old_gen_words);
 
   // Verify that all pointers in the heap point to the heap.
   bool Verify() const;
 
   // Print heap sizes.
@@ skipping 174 matching lines @@
   NoHeapGrowthControlScope();
   ~NoHeapGrowthControlScope();
  private:
   bool current_growth_controller_state_;
   DISALLOW_COPY_AND_ASSIGN(NoHeapGrowthControlScope);
 };
 
 }  // namespace dart
 
 #endif  // VM_HEAP_H_