Fix 'eval' in class extends clauses to be always-strict

src/full-codegen/full-codegen.h

Index: src/full-codegen/full-codegen.h
diff --git a/src/full-codegen/full-codegen.h b/src/full-codegen/full-codegen.h
index ac3022af194859d7a3f8d9bf9186409ee2276cfc..5185d06a4b7cc4a5802bb5e294e4841cc5f9a93e 100644
--- a/src/full-codegen/full-codegen.h
+++ b/src/full-codegen/full-codegen.h
@@ -705,7 +705,7 @@ class FullCodeGenerator: public AstVisitor {
   Handle<Script> script() { return info_->script(); }
   bool is_eval() { return info_->is_eval(); }
   bool is_native() { return info_->is_native(); }
-  LanguageMode language_mode() { return literal()->language_mode(); }
+  LanguageMode language_mode() { return scope()->language_mode(); }
   bool has_simple_parameters() { return info_->has_simple_parameters(); }
   FunctionLiteral* literal() const { return info_->literal(); }
   Scope* scope() { return scope_; }