Implement fixpoint iteration for escape analysis.

src/hydrogen-escape-analysis.cc

Index: src/hydrogen-escape-analysis.cc
diff --git a/src/hydrogen-escape-analysis.cc b/src/hydrogen-escape-analysis.cc
index 311091b6d993ddf78f7b373309d60b6869a249e7..de29266c25f3eafa35d547724dec3ac062450cf0 100644
--- a/src/hydrogen-escape-analysis.cc
+++ b/src/hydrogen-escape-analysis.cc
@@ -259,6 +259,7 @@ void HEscapeAnalysisPhase::AnalyzeDataFlow(HInstruction* allocate) {
 
 
 void HEscapeAnalysisPhase::PerformScalarReplacement() {
+  bool maybe_more_work = false;
   for (int i = 0; i < captured_.length(); i++) {
     HAllocate* allocate = HAllocate::cast(captured_.at(i));
 
@@ -269,13 +270,18 @@ void HEscapeAnalysisPhase::PerformScalarReplacement() {
     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();
 }