[heap] Add VMState to IncrementalMarking observer

src/heap/incremental-marking.h

Index: src/heap/incremental-marking.h
diff --git a/src/heap/incremental-marking.h b/src/heap/incremental-marking.h
index c777693d6341942fb4bcfbdc80c2b2e3c1264266..35978f3f8e6177463e83e0851d2ecfa2ceaf08bd 100644
--- a/src/heap/incremental-marking.h
+++ b/src/heap/incremental-marking.h
@@ -262,9 +262,7 @@ class V8_EXPORT_PRIVATE IncrementalMarking {
         : AllocationObserver(step_size),
           incremental_marking_(incremental_marking) {}
 
-    void Step(int bytes_allocated, Address, size_t) override {
-      incremental_marking_.AdvanceIncrementalMarkingOnAllocation();
-    }
+    void Step(int bytes_allocated, Address, size_t) override;
 
    private:
     IncrementalMarking& incremental_marking_;