Add materialized literals for tagged templates in preparser

src/parser.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_PARSER_H_
 #define V8_PARSER_H_
 
 #include "src/allocation.h"
 #include "src/ast.h"
 #include "src/compiler.h"  // For CachedDataMode
@@ skipping 614 matching lines @@
 
   typedef TemplateLiteral* TemplateLiteralState;
 
   V8_INLINE TemplateLiteralState OpenTemplateLiteral(int pos);
   V8_INLINE void AddTemplateSpan(TemplateLiteralState* state, bool tail);
   V8_INLINE void AddTemplateExpression(TemplateLiteralState* state,
                                        Expression* expression);
   V8_INLINE Expression* CloseTemplateLiteral(TemplateLiteralState* state,
                                              int start, Expression* tag);
   V8_INLINE Expression* NoTemplateTag() { return NULL; }
+  V8_INLINE static bool IsTaggedTemplate(const Expression* tag) {
+    return tag != NULL;
+  }
 
  private:
   Parser* parser_;
 };
 
 
 class Parser : public ParserBase<ParserTraits> {
  public:
   // Note that the hash seed in ParseInfo must be the hash seed from the
   // Isolate's heap, otherwise the heap will be in an inconsistent state once
@@ skipping 355 matching lines @@
 }
 
 
 Expression* ParserTraits::CloseTemplateLiteral(TemplateLiteralState* state,
                                                int start, Expression* tag) {
   return parser_->CloseTemplateLiteral(state, start, tag);
 }
 } }  // namespace v8::internal
 
 #endif  // V8_PARSER_H_