ES6 template literals should not use legacy octal strings

src/scanner.h

Index: src/scanner.h
diff --git a/src/scanner.h b/src/scanner.h
index d96ed579b070ecc6e83de670fc789084f1ac5ef1..6e668fd4921ca23e7dbbcd1755404c8269c20bd7 100644
--- a/src/scanner.h
+++ b/src/scanner.h
@@ -677,8 +677,9 @@ class Scanner {
   // Scans an escape-sequence which is part of a string and adds the
   // decoded character to the current literal. Returns true if a pattern
   // is scanned.
-  template <bool capture_raw>
+  template <bool capture_raw, bool in_template_literal>
   bool ScanEscape();
+
   // Decodes a Unicode escape-sequence which is part of an identifier.
   // If the escape sequence cannot be decoded the result is kBadChar.
   uc32 ScanIdentifierUnicodeEscape();