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

src/crankshaft/mips64/lithium-codegen-mips64.cc

Index: src/crankshaft/mips64/lithium-codegen-mips64.cc
diff --git a/src/crankshaft/mips64/lithium-codegen-mips64.cc b/src/crankshaft/mips64/lithium-codegen-mips64.cc
index 89fb9247f05d93840b06fc666c6fc51b4908b9bc..fd1a406647dca5e7b6c40202121c72e668ce282a 100644
--- a/src/crankshaft/mips64/lithium-codegen-mips64.cc
+++ b/src/crankshaft/mips64/lithium-codegen-mips64.cc
@@ -3997,7 +3997,6 @@ void LCodeGen::DoCallFunction(LCallFunction* instr) {
   DCHECK(ToRegister(instr->result()).is(v0));
 
   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());
@@ -4011,15 +4010,12 @@ void LCodeGen::DoCallFunction(LCallFunction* instr) {
     __ li(vector_register, vector);
     __ li(slot_register, Operand(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);
+    __ li(a0, Operand(arity));
+    CallCode(isolate()->builtins()->Call(), RelocInfo::CODE_TARGET, instr);
   }
 }