Do not cache CodeStubInterfaceDescriptor on the isolate.

src/ia32/lithium-ia32.cc

Index: src/ia32/lithium-ia32.cc
diff --git a/src/ia32/lithium-ia32.cc b/src/ia32/lithium-ia32.cc
index b99a3b1e5b1f4d132736f509056cb25f894bb317..1764dd67cdfa578403bc52bd82f2f7e9d4d3945d 100644
--- a/src/ia32/lithium-ia32.cc
+++ b/src/ia32/lithium-ia32.cc
@@ -2501,10 +2501,10 @@ LInstruction* LChunkBuilder::DoParameter(HParameter* instr) {
     return DefineAsSpilled(result, spill_index);
   } else {
     DCHECK(info()->IsStub());
-    CodeStubInterfaceDescriptor* descriptor =
-        info()->code_stub()->GetInterfaceDescriptor();
+    CodeStubInterfaceDescriptor descriptor;

[mvstanton, 2014/09/05 13:38:44]

It will be great when you allow writing:

CodeStubInterfaceDescriptor descriptor(info()->code_stub());

Looking forward to that soon!

+    info()->code_stub()->InitializeInterfaceDescriptor(&descriptor);
     int index = static_cast<int>(instr->index());
-    Register reg = descriptor->GetEnvironmentParameterRegister(index);
+    Register reg = descriptor.GetEnvironmentParameterRegister(index);
     return DefineFixed(result, reg);
   }
 }