[builtins] Start refactoring the Apply builtin.

src/code-factory.cc

Index: src/code-factory.cc
diff --git a/src/code-factory.cc b/src/code-factory.cc
index 44d971f37b10179dee5d210cd24599210b729420..6888bf8006b34645070a6967f0df5e086d5cf15a 100644
--- a/src/code-factory.cc
+++ b/src/code-factory.cc
@@ -409,6 +409,12 @@ Callable CodeFactory::CallFunction(Isolate* isolate, ConvertReceiverMode mode,
                   CallTrampolineDescriptor(isolate));
 }
 
+// static
+Callable CodeFactory::CallVarargs(Isolate* isolate) {
+  return Callable(isolate->builtins()->CallVarargs(),
+                  CallVarargsDescriptor(isolate));
+}
+
 // static
 Callable CodeFactory::CallForwardVarargs(Isolate* isolate) {
   return Callable(isolate->builtins()->CallForwardVarargs(),
@@ -439,6 +445,12 @@ Callable CodeFactory::ConstructFunction(Isolate* isolate) {
                   ConstructTrampolineDescriptor(isolate));
 }
 
+// static
+Callable CodeFactory::ConstructVarargs(Isolate* isolate) {
+  return Callable(isolate->builtins()->ConstructVarargs(),
+                  ConstructVarargsDescriptor(isolate));
+}
+
 // static
 Callable CodeFactory::ConstructForwardVarargs(Isolate* isolate) {
   return Callable(isolate->builtins()->ConstructForwardVarargs(),