[heap] Aggressive code flushing in GC stress mode.

src/heap/objects-visiting-inl.h

Index: src/heap/objects-visiting-inl.h
diff --git a/src/heap/objects-visiting-inl.h b/src/heap/objects-visiting-inl.h
index 3be5ce321b1398b4557d2f2c2ab8e5234a6e8610..51f7c7ad8147b7dabeff9b8b5c3eac3ed7048dc8 100644
--- a/src/heap/objects-visiting-inl.h
+++ b/src/heap/objects-visiting-inl.h
@@ -627,11 +627,6 @@ bool StaticMarkingVisitor<StaticVisitor>::IsFlushable(Heap* heap,
     return false;
   }
 
-  // Check age of optimized code.
-  if (FLAG_age_code && !function->code()->IsOld()) {
-    return false;
-  }
-
   return IsFlushable(heap, shared_info);
 }
 
@@ -690,6 +685,16 @@ bool StaticMarkingVisitor<StaticVisitor>::IsFlushable(
     return false;
   }
 
+  // ----------------------------------------------------------------
+  // The above predicates up to this line are hard invariants, below
+  // this line are heuristics that should not affect correctness.
+  // ----------------------------------------------------------------
+
+  // In stress mode we are aggressive.
+  if (FLAG_stress_compaction) {
+    return true;
+  }
+
   // Check age of code. If code aging is disabled we never flush.
   if (!FLAG_age_code || !shared_info->code()->IsOld()) {
     return false;