[turbofan] Optimized lowering of DYNAMIC_GLOBAL lookup slot loads.

src/ast-numbering.cc

Index: src/ast-numbering.cc
diff --git a/src/ast-numbering.cc b/src/ast-numbering.cc
index da23aad98a5249b2838046686ec1e6e80969e588..80786b107b4c815c464b6a23a0e38f30587d0788 100644
--- a/src/ast-numbering.cc
+++ b/src/ast-numbering.cc
@@ -155,7 +155,7 @@ void AstNumberingVisitor::VisitRegExpLiteral(RegExpLiteral* node) {
 void AstNumberingVisitor::VisitVariableProxy(VariableProxy* node) {
   IncrementNodeCount();
   if (node->var()->IsLookupSlot()) {
-    DisableOptimization(kReferenceToAVariableWhichRequiresDynamicLookup);
+    DisableCrankshaft(kReferenceToAVariableWhichRequiresDynamicLookup);

[Michael Starzinger, 2015/06/01 17:07:07]

Please advise on whether I should land this together with this CL or separate.

[Benedikt Meurer, 2015/06/02 04:39:49]

I think that should go in separately.

[Michael Starzinger, 2015/06/02 07:38:29]

Done.

   }
   ReserveFeedbackSlots(node);
   node->set_base_id(ReserveIdRange(VariableProxy::num_ids()));