Enable code flushing even when objects were marked incrementally,

src/mark-compact.cc

Index: src/mark-compact.cc
===================================================================
--- src/mark-compact.cc	(revision 11455)
+++ src/mark-compact.cc	(working copy)
@@ -1665,12 +1665,6 @@
 void MarkCompactCollector::PrepareForCodeFlushing() {
   ASSERT(heap() == Isolate::Current()->heap());
 
-  // TODO(1609) Currently incremental marker does not support code flushing.
-  if (!FLAG_flush_code || was_marked_incrementally_) {
-    EnableCodeFlushing(false);
-    return;
-  }
-
 #ifdef ENABLE_DEBUGGER_SUPPORT
   if (heap()->isolate()->debug()->IsLoaded() ||
       heap()->isolate()->debug()->has_break_points()) {
@@ -1975,6 +1969,7 @@
 
 
 static void DiscoverGreyObjectsOnPage(MarkingDeque* marking_deque, Page* p) {
+  ASSERT(!marking_deque->IsFull());
   ASSERT(strcmp(Marking::kWhiteBitPattern, "00") == 0);
   ASSERT(strcmp(Marking::kBlackBitPattern, "10") == 0);
   ASSERT(strcmp(Marking::kGreyBitPattern, "11") == 0);