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 997e4f9445f79ab3f7ba079acb54be1f6e25deb8..20c36800a2a4030e94ba73a7d542d132c7d4b6c1 100644
--- a/src/hydrogen-escape-analysis.cc
+++ b/src/hydrogen-escape-analysis.cc
@@ -307,7 +307,7 @@ void HEscapeAnalysisPhase::PerformScalarReplacement() {
     number_of_objects_++;
     block_states_.Clear();
 
-    // Perform actual analysis steps.
+    // Perform actual analysis step.
     AnalyzeDataFlow(allocate);
 
     cumulative_values_ += number_of_values_;
@@ -321,8 +321,12 @@ void HEscapeAnalysisPhase::Run() {
   // TODO(mstarzinger): We disable escape analysis with OSR for now, because
   // spill slots might be uninitialized. Needs investigation.
   if (graph()->has_osr()) return;
-  CollectCapturedValues();
-  PerformScalarReplacement();
+  for (int i = 0; i < kMaxFixpointIterationCount; i++) {
+    CollectCapturedValues();
+    if (captured_.is_empty()) break;
+    PerformScalarReplacement();
+    captured_.Clear();
+  }
 }