[modules] Introduce new VariableLocation for module imports/exports.

src/contexts.cc

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/contexts.h"
 
 #include "src/bootstrapper.h"
 #include "src/debug/debug.h"
 #include "src/isolate-inl.h"
 
@@ skipping 184 matching lines @@
       DCHECK_EQ(kCreatedInitialized, init_flag);
       *attributes = READ_ONLY;
       *binding_flags = BINDING_IS_INITIALIZED;
       break;
     case CONST:
       *attributes = READ_ONLY;
       *binding_flags = (init_flag == kNeedsInitialization)
                            ? BINDING_CHECK_INITIALIZED
                            : BINDING_IS_INITIALIZED;
       break;
-    case IMPORT:  // TODO(neis): Make sure this is what we want for IMPORT.
     case DYNAMIC:
     case DYNAMIC_GLOBAL:
     case DYNAMIC_LOCAL:
     case TEMPORARY:
       // Note: Fixed context slots are statically allocated by the compiler.
       // Statically allocated variables always have a statically known mode,
       // which is the mode with which they were declared when added to the
       // scope. Thus, the DYNAMIC mode (which corresponds to dynamically
       // declared variables that were introduced through declaration nodes)
       // must not appear here.
@@ skipping 393 matching lines @@
 
   int previous_value = errors_thrown()->value();
   set_errors_thrown(Smi::FromInt(previous_value + 1));
 }
 
 
 int Context::GetErrorsThrown() { return errors_thrown()->value(); }
 
 }  // namespace internal
 }  // namespace v8