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..56865aeaa1e851bde088ee386764b5b828d9006b 100644
--- a/src/hydrogen.h
+++ b/src/hydrogen.h
@@ -1781,6 +1781,8 @@ class HOptimizedGraphBuilder V8_FINAL
 
   HValue* context() { return environment()->context(); }
 
+  HOsrBuilder* osr() { return osr_; }

[Michael Starzinger, 2013/09/27 13:26:22]

nit: Can be made const.

[mvstanton, 2013/09/27 13:31:43]

Done.

+
   void Bailout(BailoutReason reason);
 
   HBasicBlock* CreateJoin(HBasicBlock* first,
@@ -1791,6 +1793,12 @@ class HOptimizedGraphBuilder V8_FINAL
 
   void VisitDeclarations(ZoneList<Declaration*>* declarations);
 
+  // Build a loop entry
+  HBasicBlock* BuildLoopEntry();

[Michael Starzinger, 2013/09/27 13:26:22]

nit: Let's move these two declarations near CreateLoop(), this makes it clear
that they are counterparts to each other.

[mvstanton, 2013/09/27 13:31:43]

Done.

+
+  // Builds a loop entry respectful of OSR requirements
+  HBasicBlock* BuildLoopEntry(IterationStatement* statement);
+
   void* operator new(size_t size, Zone* zone) {
     return zone->New(static_cast<int>(size));
   }