Revert of Continue learning for calls in optimized code when we have no type feedback.

src/x64/lithium-codegen-x64.cc

Index: src/x64/lithium-codegen-x64.cc
diff --git a/src/x64/lithium-codegen-x64.cc b/src/x64/lithium-codegen-x64.cc
index 67528bbec22394525852bc37099edf2871576b8f..383795c8a0784134880d27122f34d13510931b3d 100644
--- a/src/x64/lithium-codegen-x64.cc
+++ b/src/x64/lithium-codegen-x64.cc
@@ -4033,29 +4033,8 @@
   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());
-    DCHECK(slot_register.is(rdx));
-    DCHECK(vector_register.is(rbx));
-
-    Handle<TypeFeedbackVector> vector = instr->hydrogen()->feedback_vector();
-    int index = vector->GetIndex(instr->hydrogen()->slot());
-
-    __ 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();
-    CallCode(ic, RelocInfo::CODE_TARGET, instr);
-  } else {
-    CallFunctionStub stub(isolate(), arity, flags);
-    CallCode(stub.GetCode(), RelocInfo::CODE_TARGET, instr);
-  }
+  CallFunctionStub stub(isolate(), arity, instr->hydrogen()->function_flags());
+  CallCode(stub.GetCode(), RelocInfo::CODE_TARGET, instr);
 }