X64: Optimize access to external references.

src/x64/deoptimizer-x64.cc

Index: src/x64/deoptimizer-x64.cc
diff --git a/src/x64/deoptimizer-x64.cc b/src/x64/deoptimizer-x64.cc
index 257b7eab465c33ee2004b0492f27b1af94b92d48..fe19f01aef1ad2669f0ef6562853db3a1f1a8b46 100644
--- a/src/x64/deoptimizer-x64.cc
+++ b/src/x64/deoptimizer-x64.cc
@@ -757,7 +757,6 @@ void Deoptimizer::EntryGenerator::Generate() {
   }
 
   // Set up the roots register.
-  ExternalReference roots_address = ExternalReference::roots_address();

[William Hesse, 2011/03/22 14:05:08]

Could this be necessary for serialization reasons?

[Lasse Reichstein, 2011/03/22 14:12:21]

I don't see how. It's a local variable that isn't used anywhere.
I think it's just a leftover from when InitializeRootRegister was introduced.

   __ InitializeRootRegister();
   __ InitializeSmiConstantRegister();