[parser] Lift template literal invalid escape restriction

src/parsing/parser.h

Index: src/parsing/parser.h
diff --git a/src/parsing/parser.h b/src/parsing/parser.h
index 934068d8f51e1787dadaf44e9964829bc61d0b7d..99ead483b46cac653421f14390877c0f9e2664f4 100644
--- a/src/parsing/parser.h
+++ b/src/parsing/parser.h
@@ -586,7 +586,8 @@ class V8_EXPORT_PRIVATE Parser : public NON_EXPORTED_BASE(ParserBase<Parser>) {
   typedef TemplateLiteral* TemplateLiteralState;
 
   TemplateLiteralState OpenTemplateLiteral(int pos);
-  void AddTemplateSpan(TemplateLiteralState* state, bool tail);
+  void AddTemplateSpan(TemplateLiteralState* state, bool should_cook,

[adamk, 2017/02/07 20:55:13]

Can you give this method a comment? Neither "should_cook" nor "tail" mean much
to someone not familiar with template strings.

[bakkot1, 2017/02/13 20:22:24]

Done.

+                       bool tail);
   void AddTemplateExpression(TemplateLiteralState* state,
                              Expression* expression);
   Expression* CloseTemplateLiteral(TemplateLiteralState* state, int start,