[debugger] Move clearing of optimized code map out of GC.

src/debug/debug.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/debug/debug.h"
 
 #include "src/api.h"
 #include "src/arguments.h"
 #include "src/bootstrapper.h"
 #include "src/code-stubs.h"
@@ skipping 1287 matching lines @@
 bool Debug::PrepareFunctionForBreakPoints(Handle<SharedFunctionInfo> shared) {
   DCHECK(shared->is_compiled());
 
   if (isolate_->concurrent_recompilation_enabled()) {
     isolate_->optimizing_compile_dispatcher()->Flush();
   }
 
   List<Handle<JSFunction> > functions;
   List<Handle<JSGeneratorObject> > suspended_generators;
 
-  if (!shared->optimized_code_map()->IsSmi()) {
-    shared->ClearOptimizedCodeMap();
+  // Flush all optimized code maps. Note that the below heap iteration does not
+  // cover this, because the given function might have been inlined into code
+  // for which no JSFunction exists.
+  {
+    SharedFunctionInfo::Iterator iterator(isolate_);
+    while (SharedFunctionInfo* shared = iterator.Next()) {
+      if (!shared->optimized_code_map()->IsSmi()) {
+        shared->ClearOptimizedCodeMap();
+      }
+    }
   }
 
   // Make sure we abort incremental marking.
   isolate_->heap()->CollectAllGarbage(Heap::kMakeHeapIterableMask,
                                       "prepare for break points");
 
   {
     HeapIterator iterator(isolate_->heap());
     HeapObject* obj;
     bool include_generators = shared->is_generator();
@@ skipping 1261 matching lines @@
 }
 
 
 void LockingCommandMessageQueue::Clear() {
   base::LockGuard<base::Mutex> lock_guard(&mutex_);
   queue_.Clear();
 }
 
 }  // namespace internal
 }  // namespace v8