[Interpreter] Avoid accessing Isolate from during bytecode generation.

src/ast/scopes.h

 // Copyright 2012 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.
 
 #ifndef V8_AST_SCOPES_H_
 #define V8_AST_SCOPES_H_
 
 #include "src/ast/ast.h"
 #include "src/base/hashmap.h"
 #include "src/globals.h"
@@ skipping 394 matching lines @@
   // function, or eval scope. Same as DeclarationScope(), but skips declaration
   // "block" scopes. Used for differentiating associated function objects (i.e.,
   // the scope for which a function prologue allocates a context) or declaring
   // temporaries.
   DeclarationScope* GetClosureScope();
 
   // Find the first (non-arrow) function or script scope.  This is where
   // 'this' is bound, and what determines the function kind.
   DeclarationScope* GetReceiverScope();
 
+  // Creates a scope info if it doesn't already exist.
   Handle<ScopeInfo> GetScopeInfo(Isolate* isolate);
 
+  // GetScopeInfo() must have been called once to create the ScopeInfo.
+  Handle<ScopeInfo> scope_info() {
+    DCHECK(!scope_info_.is_null());
+    return scope_info_;
+  }
+
   // ---------------------------------------------------------------------------
   // Strict mode support.
   bool IsDeclared(const AstRawString* name) {
     // During formal parameter list parsing the scope only contains
     // two variables inserted at initialization: "this" and "arguments".
     // "this" is an invalid parameter name and "arguments" is invalid parameter
     // name in strict mode. Therefore looking up with the map which includes
     // "this" and "arguments" in addition to all formal parameters is safe.
     return variables_.Lookup(name) != NULL;
   }
@@ skipping 457 matching lines @@
   // Convenience variable; Subclass constructor only
   Variable* this_function_;
   // Module descriptor; module scopes only.
   ModuleDescriptor* module_descriptor_;
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_AST_SCOPES_H_