[Isolates] Merge crankshaft (r5922 from bleeding_edge).

src/arm/simulator-arm.h

Index: src/arm/simulator-arm.h
diff --git a/src/arm/simulator-arm.h b/src/arm/simulator-arm.h
index eb82718fb9df42d402713c2aae157be1f9af0e5f..9f4829304b611c246428adc44efd80f702e77c6c 100644
--- a/src/arm/simulator-arm.h
+++ b/src/arm/simulator-arm.h
@@ -185,6 +185,10 @@ class Simulator {
   static void FlushICache(v8::internal::HashMap* i_cache, void* start,
                           size_t size);
 
+  // Returns true if pc register contains one of the 'special_values' defined
+  // below (bad_lr, end_sim_pc).
+  bool has_bad_pc() const;
+
  private:
   enum special_values {
     // Known bad pc value to ensure that the simulator does not execute