[turbofan] Some javascript operators are globally shared singletons.

src/compiler/ast-graph-builder.h

Index: src/compiler/ast-graph-builder.h
diff --git a/src/compiler/ast-graph-builder.h b/src/compiler/ast-graph-builder.h
index b62235547b98407f0c9422061325c54e83f43936..feded98b4e9b0f20a0b87bdc08b3bb0703848d64 100644
--- a/src/compiler/ast-graph-builder.h
+++ b/src/compiler/ast-graph-builder.h
@@ -131,8 +131,8 @@ class AstGraphBuilder : public StructuredGraphBuilder, public AstVisitor {
   SetOncePointer<Node> function_closure_;
   SetOncePointer<Node> function_context_;
 
-  CompilationInfo* info() { return info_; }
-  StrictMode strict_mode() { return info()->strict_mode(); }
+  CompilationInfo* info() const { return info_; }
+  inline StrictMode strict_mode() const;
   JSGraph* jsgraph() { return jsgraph_; }
   JSOperatorBuilder* javascript() { return jsgraph_->javascript(); }
   ZoneList<Handle<Object> >* globals() { return &globals_; }