Only call into the HOsrBuilder if required for OSR.

src/hydrogen.h

Index: src/hydrogen.h
diff --git a/src/hydrogen.h b/src/hydrogen.h
index be23fa84c34fcf54dc58a33cb9f9613410232109..9b998c92b9282e6d2a14abcdd30dd5ff771b96c7 100644
--- a/src/hydrogen.h
+++ b/src/hydrogen.h
@@ -1781,6 +1781,8 @@ class HOptimizedGraphBuilder V8_FINAL
 
   HValue* context() { return environment()->context(); }
 
+  HOsrBuilder* osr() const { return osr_; }
+
   void Bailout(BailoutReason reason);
 
   HBasicBlock* CreateJoin(HBasicBlock* first,
@@ -1886,6 +1888,12 @@ class HOptimizedGraphBuilder V8_FINAL
                           HBasicBlock* loop_successor,
                           HBasicBlock* break_block);
 
+  // Build a loop entry
+  HBasicBlock* BuildLoopEntry();
+
+  // Builds a loop entry respectful of OSR requirements
+  HBasicBlock* BuildLoopEntry(IterationStatement* statement);
+
   HBasicBlock* JoinContinue(IterationStatement* statement,
                             HBasicBlock* exit_block,
                             HBasicBlock* continue_block);