Only call into the HOsrBuilder if required for OSR.

src/hydrogen-osr.h

Index: src/hydrogen-osr.h
diff --git a/src/hydrogen-osr.h b/src/hydrogen-osr.h
index 5014a75bdaf94f32fab0c9bc7b05196856d8589f..ae72ce650c59d198056c5b13db48c258f90109f4 100644
--- a/src/hydrogen-osr.h
+++ b/src/hydrogen-osr.h
@@ -45,9 +45,10 @@ class HOsrBuilder : public ZoneObject {
       osr_entry_(NULL),
       osr_loop_entry_(NULL),
       osr_values_(NULL) { }
+
   // Creates the loop entry block for the given statement, setting up OSR
   // entries as necessary, and sets the current block to the new block.
-  HBasicBlock* BuildPossibleOsrLoopEntry(IterationStatement* statement);
+  HBasicBlock* BuildOsrLoopEntry(IterationStatement* statement);
 
   // Process the hydrogen graph after it has been completed, performing
   // any OSR-specific cleanups or changes.
@@ -61,10 +62,9 @@ class HOsrBuilder : public ZoneObject {
     return unoptimized_frame_slots_;
   }
 
- private:
-  HBasicBlock* BuildLoopEntry();
   bool HasOsrEntryAt(IterationStatement* statement);
 
+ private:
   int unoptimized_frame_slots_;
   HOptimizedGraphBuilder* builder_;
   HBasicBlock* osr_entry_;