Change halfway-to-the-max GC trigger to measure committed pages, not allocated objects

src/heap/mark-compact.h

Index: src/heap/mark-compact.h
diff --git a/src/heap/mark-compact.h b/src/heap/mark-compact.h
index b08ff36ea8ace70ccf860fb6dbc66a8a22465814..887cd4d6e9df681320144cdede0fde4bf19ab992 100644
--- a/src/heap/mark-compact.h
+++ b/src/heap/mark-compact.h
@@ -615,7 +615,9 @@ class MarkCompactCollector {
 
   void ClearMarkbits();
 
-  bool abort_incremental_marking() const { return abort_incremental_marking_; }
+  bool incremental_marking_abort_requested() const {
+    return incremental_marking_abort_requested_;
+  }
 
   bool is_compacting() const { return compacting_; }
 
@@ -705,7 +707,7 @@ class MarkCompactCollector {
 
   bool reduce_memory_footprint_;
 
-  bool abort_incremental_marking_;
+  bool incremental_marking_abort_requested_;
 
   MarkingParity marking_parity_;