Simplify feedback vector creation and store in SharedFunctionInfo.

src/ast.cc

Index: src/ast.cc
diff --git a/src/ast.cc b/src/ast.cc
index a1037f79163c90e48d5ac4125b868f670ddec96a..1db5ffe3097c8d96bb2d54134175c334e92d3593 100644
--- a/src/ast.cc
+++ b/src/ast.cc
@@ -594,14 +594,9 @@ void Expression::RecordToBooleanTypeFeedback(TypeFeedbackOracle* oracle) {
 }
 
 
-int Call::ComputeFeedbackSlotCount(Isolate* isolate) {
+bool Call::IsUsingCallFeedbackSlot(Isolate* isolate) const {
   CallType call_type = GetCallType(isolate);
-  if (call_type == LOOKUP_SLOT_CALL || call_type == OTHER_CALL) {
-    // Call only uses a slot in some cases.
-    return 1;
-  }
-
-  return 0;
+  return call_type == LOOKUP_SLOT_CALL || call_type == OTHER_CALL;
 }