[es8] More spec compliant syntactic tail calls implementation.

src/parsing/parser.h

Index: src/parsing/parser.h
diff --git a/src/parsing/parser.h b/src/parsing/parser.h
index 9417a76bfd49abb630a087b9aa6e7e7b8eb2db8f..3ae2619a6562f24f56666df021e81b440f14eba8 100644
--- a/src/parsing/parser.h
+++ b/src/parsing/parser.h
@@ -573,6 +573,7 @@ class ParserTraits {
                                   bool name_is_strict_reserved, int pos,
                                   bool* ok);
 
+  V8_INLINE void MarkCollectedTailCallExpressions();
   V8_INLINE void MarkTailPosition(Expression* expression);
 
   V8_INLINE void CheckConflictingVarDeclarations(v8::internal::Scope* scope,
@@ -1048,6 +1049,8 @@ class Parser : public ParserBase<ParserTraits> {
   void SetLanguageMode(Scope* scope, LanguageMode mode);
   void RaiseLanguageMode(LanguageMode mode);
 
+  V8_INLINE void MarkCollectedTailCallExpressions();
+
   V8_INLINE void RewriteDestructuringAssignments();
 
   V8_INLINE Expression* RewriteExponentiation(Expression* left,