Tweak the context disposal GC heuristic: If the garbage collector ...

src/heap.cc

Index: src/heap.cc
===================================================================
--- src/heap.cc	(revision 1421)
+++ src/heap.cc	(working copy)
@@ -295,11 +295,15 @@
 
 
 void Heap::CollectAllGarbageIfContextDisposed() {
-  if (context_disposed_pending_) {
+  // If the garbage collector interface is exposed through the global
+  // gc() function, we avoid being clever about forcing GCs when
+  // contexts are disposed and leave it to the embedder to make
+  // informed decisions about when to force a collection.
+  if (!FLAG_expose_gc && context_disposed_pending_) {
     StatsRateScope scope(&Counters::gc_context);
     CollectAllGarbage();
-    context_disposed_pending_ = false;
   }
+  context_disposed_pending_ = false;
 }