[turbofan] Add performance counters for escape analysis

src/crankshaft/hydrogen-escape-analysis.cc

 // Copyright 2013 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/crankshaft/hydrogen-escape-analysis.h"
 
 namespace v8 {
 namespace internal {
 
 
@@ skipping 124 matching lines @@
                                         mapcheck->maps()->at(0), false);
   check->InsertBefore(mapcheck);
   return check;
 }
 
 
 // Replace a field load with a given value, forcing Smi representation if
 // necessary.
 HValue* HEscapeAnalysisPhase::NewLoadReplacement(
     HLoadNamedField* load, HValue* load_value) {
+  isolate()->counters()->crankshaft_escape_loads_replaced()->Increment();
   HValue* replacement = load_value;
   Representation representation = load->representation();
   if (representation.IsSmiOrInteger32() || representation.IsDouble()) {
     Zone* zone = graph()->zone();
     HInstruction* new_instr = HForceRepresentation::New(
         graph()->isolate(), zone, NULL, load_value, representation);
     new_instr->InsertAfter(load);
     replacement = new_instr;
   }
   return replacement;
@@ skipping 157 matching lines @@
 
 
 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;
   int max_fixpoint_iteration_count = FLAG_escape_analysis_iterations;
   for (int i = 0; i < max_fixpoint_iteration_count; i++) {
     CollectCapturedValues();
     if (captured_.is_empty()) break;
+    isolate()->counters()->crankshaft_escape_allocs_replaced()->Increment(
+        captured_.length());
     PerformScalarReplacement();
     captured_.Rewind(0);
   }
 }
 
 
 }  // namespace internal
 }  // namespace v8