Implement fixpoint iteration for escape analysis.

src/hydrogen-escape-analysis.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 241 matching lines @@
     }
   }
 
   // All uses have been handled.
   ASSERT(allocate->HasNoUses());
   allocate->DeleteAndReplaceWith(NULL);
 }
 
 
 void HEscapeAnalysisPhase::PerformScalarReplacement() {
+  bool maybe_more_work = false;
   for (int i = 0; i < captured_.length(); i++) {
     HAllocate* allocate = HAllocate::cast(captured_.at(i));
 
     // Compute number of scalar values and start with clean slate.
     if (!allocate->size()->IsInteger32Constant()) continue;
     int size_in_bytes = allocate->size()->GetInteger32Constant();
     number_of_values_ = size_in_bytes / kPointerSize;
     number_of_objects_++;
     block_states_.Clear();
 
-    // Perform actual analysis steps.
+    // Perform actual analysis step.
     AnalyzeDataFlow(allocate);
 
+    maybe_more_work = true;
     cumulative_values_ += number_of_values_;
     ASSERT(allocate->HasNoUses());
     ASSERT(!allocate->IsLinked());
   }
+
+  // Clear captured objects.
+  maybe_more_work_ = maybe_more_work;
+  captured_.Clear();
 }
 
 
 } }  // namespace v8::internal