Track async causal stack traces

runtime/vm/dart.cc

Index: runtime/vm/dart.cc
diff --git a/runtime/vm/dart.cc b/runtime/vm/dart.cc
index 916e81bb14824779a26edcc42172197091448e00..978f5468d1563570da08a1d156c99e0f12334105 100644
--- a/runtime/vm/dart.cc
+++ b/runtime/vm/dart.cc
@@ -92,7 +92,7 @@ static void CheckOffsets() {
   // (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(), 36);
+  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));
@@ -102,7 +102,7 @@ static void CheckOffsets() {
   // (compiler) and mips (runtime) to agree.
   CHECK_OFFSET(Heap::TopOffset(Heap::kNew), 8);
   CHECK_OFFSET(Thread::stack_limit_offset(), 4);
-  CHECK_OFFSET(Thread::object_null_offset(), 36);
+  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));
@@ -112,7 +112,7 @@ static void CheckOffsets() {
   // (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(), 72);
+  CHECK_OFFSET(Thread::object_null_offset(), 80);
   CHECK_OFFSET(SingleTargetCache::upper_limit_offset(), 28);
   CHECK_OFFSET(Isolate::object_store_offset(), 56);
   NOT_IN_PRODUCT(CHECK_OFFSET(sizeof(ClassHeapStats), 208));