Revert "Moves the top_ and end_ words of the Scavenger into mutator thread."

runtime/vm/dart.cc

 // Copyright (c) 2013, 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.
 
 #include "vm/dart.h"
 
 #include "vm/become.h"
 #include "vm/clustered_snapshot.h"
 #include "vm/code_observers.h"
 #include "vm/cpu.h"
@@ skipping 72 matching lines @@
 
 static void CheckOffsets() {
 #define CHECK_OFFSET(expr, offset)                                             \
   if ((expr) != (offset)) {                                                    \
     FATAL2("%s == %" Pd, #expr, (expr));                                       \
   }
 
 #if defined(TARGET_ARCH_ARM)
   // These offsets are embedded in precompiled instructions. We need simarm
   // (compiler) and arm (runtime) to agree.
+  CHECK_OFFSET(Heap::TopOffset(Heap::kNew), 8);
   CHECK_OFFSET(Thread::stack_limit_offset(), 4);
-  CHECK_OFFSET(Thread::object_null_offset(), 48);
+  CHECK_OFFSET(Thread::object_null_offset(), 40);
   CHECK_OFFSET(SingleTargetCache::upper_limit_offset(), 14);
   CHECK_OFFSET(Isolate::object_store_offset(), 28);
   NOT_IN_PRODUCT(CHECK_OFFSET(sizeof(ClassHeapStats), 120));
 #endif
 #if defined(TARGET_ARCH_ARM64)
   // These offsets are embedded in precompiled instructions. We need simarm64
   // (compiler) and arm64 (runtime) to agree.
+  CHECK_OFFSET(Heap::TopOffset(Heap::kNew), 8);
   CHECK_OFFSET(Thread::stack_limit_offset(), 8);
-  CHECK_OFFSET(Thread::object_null_offset(), 96);
+  CHECK_OFFSET(Thread::object_null_offset(), 80);
   CHECK_OFFSET(SingleTargetCache::upper_limit_offset(), 26);
   CHECK_OFFSET(Isolate::object_store_offset(), 56);
   NOT_IN_PRODUCT(CHECK_OFFSET(sizeof(ClassHeapStats), 208));
 #endif
 #undef CHECK_OFFSET
 }
 
 
 char* Dart::InitOnce(const uint8_t* vm_isolate_snapshot,
                      const uint8_t* instructions_snapshot,
@@ skipping 651 matching lines @@
   return predefined_handles_->handles_.IsValidScopedHandle(address);
 }
 
 
 bool Dart::IsReadOnlyApiHandle(Dart_Handle handle) {
   ASSERT(predefined_handles_ != NULL);
   return predefined_handles_->api_handles_.IsValidHandle(handle);
 }
 
 }  // namespace dart