Remove CallFunctionStub, always call through the Call builtin (also from CallIC)

src/crankshaft/x64/lithium-codegen-x64.cc

Index: src/crankshaft/x64/lithium-codegen-x64.cc
diff --git a/src/crankshaft/x64/lithium-codegen-x64.cc b/src/crankshaft/x64/lithium-codegen-x64.cc
index 5bd0a62198064be057ac6a1087578195ef77ea15..a7b4a5c7059038864419146788405797076b23b2 100644
--- a/src/crankshaft/x64/lithium-codegen-x64.cc
+++ b/src/crankshaft/x64/lithium-codegen-x64.cc
@@ -3861,7 +3861,6 @@ void LCodeGen::DoCallFunction(LCallFunction* instr) {
   DCHECK(ToRegister(instr->result()).is(rax));
 
   int arity = instr->arity();
-  CallFunctionFlags flags = instr->hydrogen()->function_flags();
   if (instr->hydrogen()->HasVectorAndSlot()) {
     Register slot_register = ToRegister(instr->temp_slot());
     Register vector_register = ToRegister(instr->temp_vector());
@@ -3875,15 +3874,12 @@ void LCodeGen::DoCallFunction(LCallFunction* instr) {
     __ Move(vector_register, vector);
     __ Move(slot_register, Smi::FromInt(index));
 
-    CallICState::CallType call_type =
-        (flags & CALL_AS_METHOD) ? CallICState::METHOD : CallICState::FUNCTION;
-
     Handle<Code> ic =
-        CodeFactory::CallICInOptimizedCode(isolate(), arity, call_type).code();
+        CodeFactory::CallICInOptimizedCode(isolate(), arity).code();
     CallCode(ic, RelocInfo::CODE_TARGET, instr);
   } else {
-    CallFunctionStub stub(isolate(), arity, flags);
-    CallCode(stub.GetCode(), RelocInfo::CODE_TARGET, instr);
+    __ Set(rax, arity);
+    CallCode(isolate()->builtins()->Call(), RelocInfo::CODE_TARGET, instr);
   }
 }