Strip Interface class of most of its logic, make it all about Module exports

src/arm/full-codegen-arm.cc

Index: src/arm/full-codegen-arm.cc
diff --git a/src/arm/full-codegen-arm.cc b/src/arm/full-codegen-arm.cc
index 8a8fe378df08764741b2994b4bb023d7235b12ee..5fe3bd549947cfb14e0b080c1447f2a3ac00ad6c 100644
--- a/src/arm/full-codegen-arm.cc
+++ b/src/arm/full-codegen-arm.cc
@@ -938,15 +938,16 @@ void FullCodeGenerator::VisitFunctionDeclaration(
 
 void FullCodeGenerator::VisitModuleDeclaration(ModuleDeclaration* declaration) {
   Variable* variable = declaration->proxy()->var();
+  Interface* interface = declaration->module()->interface();
   DCHECK(variable->location() == Variable::CONTEXT);
-  DCHECK(variable->interface()->IsFrozen());
+  DCHECK(interface->IsFrozen());
 
   Comment cmnt(masm_, "[ ModuleDeclaration");
   EmitDebugCheckDeclarationContext(variable);
 
   // Load instance object.
   __ LoadContext(r1, scope_->ContextChainLength(scope_->ScriptScope()));
-  __ ldr(r1, ContextOperand(r1, variable->interface()->Index()));
+  __ ldr(r1, ContextOperand(r1, interface->Index()));
   __ ldr(r1, ContextOperand(r1, Context::EXTENSION_INDEX));
 
   // Assign it.