Revert of [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 51f7c7ad8147b7dabeff9b8b5c3eac3ed7048dc8..3be5ce321b1398b4557d2f2c2ab8e5234a6e8610 100644
--- a/src/heap/objects-visiting-inl.h
+++ b/src/heap/objects-visiting-inl.h
@@ -627,6 +627,11 @@
     return false;
   }
 
+  // Check age of optimized code.
+  if (FLAG_age_code && !function->code()->IsOld()) {
+    return false;
+  }
+
   return IsFlushable(heap, shared_info);
 }
 
@@ -683,16 +688,6 @@
   // relation between SharedFunctionInfo and Code is broken.
   if (shared_info->dont_flush()) {
     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.