[builtins] Start refactoring the Apply builtin.

src/builtins/builtins.h

Index: src/builtins/builtins.h
diff --git a/src/builtins/builtins.h b/src/builtins/builtins.h
index 1e771f40ce72ebd578a4c6088b894e236f720773..55baf120a1c5dd8f95c2f6a9304912568035b8ee 100644
--- a/src/builtins/builtins.h
+++ b/src/builtins/builtins.h
@@ -126,7 +126,10 @@ class Builtins {
   static void Generate_Call(MacroAssembler* masm, ConvertReceiverMode mode,
                             TailCallMode tail_call_mode);
 
-  static void Generate_ForwardVarargs(MacroAssembler* masm, Handle<Code> code);
+  static void Generate_CallOrConstructVarargs(MacroAssembler* masm,
+                                              Handle<Code> code);
+  static void Generate_CallOrConstructForwardVarargs(MacroAssembler* masm,
+                                                     Handle<Code> code);
 
   static void Generate_InterpreterPushArgsThenCallImpl(
       MacroAssembler* masm, ConvertReceiverMode receiver_mode,