[es6] [interpreter] Add tail calls support to Ignition.

src/builtins.h

Index: src/builtins.h
diff --git a/src/builtins.h b/src/builtins.h
index e7c94f538c3ed532160fd4a767f8f28f32c2570e..c245f4d74155bd7188d308652c18abbf2a39b511 100644
--- a/src/builtins.h
+++ b/src/builtins.h
@@ -214,6 +214,7 @@ inline bool operator&(BuiltinExtraArguments lhs, BuiltinExtraArguments rhs) {
   V(InterpreterEntryTrampoline, BUILTIN, UNINITIALIZED, kNoExtraICState)       \
   V(InterpreterExitTrampoline, BUILTIN, UNINITIALIZED, kNoExtraICState)        \
   V(InterpreterPushArgsAndCall, BUILTIN, UNINITIALIZED, kNoExtraICState)       \
+  V(InterpreterPushArgsAndTailCall, BUILTIN, UNINITIALIZED, kNoExtraICState)   \
   V(InterpreterPushArgsAndConstruct, BUILTIN, UNINITIALIZED, kNoExtraICState)  \
   V(InterpreterNotifyDeoptimized, BUILTIN, UNINITIALIZED, kNoExtraICState)     \
   V(InterpreterNotifySoftDeoptimized, BUILTIN, UNINITIALIZED, kNoExtraICState) \
@@ -362,6 +363,7 @@ class Builtins {
   Handle<Code> Call(ConvertReceiverMode = ConvertReceiverMode::kAny,
                     TailCallMode tail_call_mode = TailCallMode::kDisallow);
   Handle<Code> CallBoundFunction(TailCallMode tail_call_mode);
+  Handle<Code> InterpreterPushArgsAndCall(TailCallMode tail_call_mode);
 
   Code* builtin(Name name) {
     // Code::cast cannot be used here since we access builtins
@@ -577,7 +579,15 @@ class Builtins {
 
   static void Generate_InterpreterEntryTrampoline(MacroAssembler* masm);
   static void Generate_InterpreterExitTrampoline(MacroAssembler* masm);
-  static void Generate_InterpreterPushArgsAndCall(MacroAssembler* masm);
+  static void Generate_InterpreterPushArgsAndCall(MacroAssembler* masm) {
+    return Generate_InterpreterPushArgsAndCallImpl(masm,
+                                                   TailCallMode::kDisallow);
+  }
+  static void Generate_InterpreterPushArgsAndTailCall(MacroAssembler* masm) {
+    return Generate_InterpreterPushArgsAndCallImpl(masm, TailCallMode::kAllow);
+  }
+  static void Generate_InterpreterPushArgsAndCallImpl(
+      MacroAssembler* masm, TailCallMode tail_call_mode);
   static void Generate_InterpreterPushArgsAndConstruct(MacroAssembler* masm);
   static void Generate_InterpreterNotifyDeoptimized(MacroAssembler* masm);
   static void Generate_InterpreterNotifySoftDeoptimized(MacroAssembler* masm);