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 3ffeeed7b17aa2961ca9a48e7544b685aae8736f..d8c720ee487e7124507dfe40e424b3e6e23fbd81 100644
--- a/src/heap/mark-compact.h
+++ b/src/heap/mark-compact.h
@@ -636,7 +636,9 @@ 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_; }
 
@@ -725,7 +727,7 @@ class MarkCompactCollector {
 
   bool reduce_memory_footprint_;
 
-  bool abort_incremental_marking_;
+  bool incremental_marking_abort_requested_;
 
   MarkingParity marking_parity_;