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

src/crankshaft/ia32/lithium-codegen-ia32.cc

Index: src/crankshaft/ia32/lithium-codegen-ia32.cc
diff --git a/src/crankshaft/ia32/lithium-codegen-ia32.cc b/src/crankshaft/ia32/lithium-codegen-ia32.cc
index 1fa61029b6b43af54850edfd01bdddf80f9fef2e..21ca69ca79da2b46c864234d207be98ed69e9256 100644
--- a/src/crankshaft/ia32/lithium-codegen-ia32.cc
+++ b/src/crankshaft/ia32/lithium-codegen-ia32.cc
@@ -3774,7 +3774,6 @@ void LCodeGen::DoCallFunction(LCallFunction* instr) {
   DCHECK(ToRegister(instr->result()).is(eax));
 
   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());
@@ -3788,15 +3787,12 @@ void LCodeGen::DoCallFunction(LCallFunction* instr) {
     __ mov(vector_register, vector);
     __ mov(slot_register, Immediate(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(eax, arity);
+    CallCode(isolate()->builtins()->Call(), RelocInfo::CODE_TARGET, instr);
   }
 }