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

runtime/vm/dart.cc

Index: runtime/vm/dart.cc
diff --git a/runtime/vm/dart.cc b/runtime/vm/dart.cc
index 33ca87bf6baab486d5b9ce714e7088bc5030b332..ade13a9c89ee2757d9f5e42058e3e118b3d3daf1 100644
--- a/runtime/vm/dart.cc
+++ b/runtime/vm/dart.cc
@@ -90,9 +90,8 @@ static void CheckOffsets() {
 #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(), 40);
+  CHECK_OFFSET(Thread::object_null_offset(), 48);
   CHECK_OFFSET(SingleTargetCache::upper_limit_offset(), 14);
   CHECK_OFFSET(Isolate::object_store_offset(), 28);
   NOT_IN_PRODUCT(CHECK_OFFSET(sizeof(ClassHeapStats), 120));
@@ -100,9 +99,8 @@ static void CheckOffsets() {
 #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(), 80);
+  CHECK_OFFSET(Thread::object_null_offset(), 96);
   CHECK_OFFSET(SingleTargetCache::upper_limit_offset(), 26);
   CHECK_OFFSET(Isolate::object_store_offset(), 56);
   NOT_IN_PRODUCT(CHECK_OFFSET(sizeof(ClassHeapStats), 208));