[debug] use best effort coverage when enabling precise coverage.

src/feedback-vector-inl.h

Index: src/feedback-vector-inl.h
diff --git a/src/feedback-vector-inl.h b/src/feedback-vector-inl.h
index 9013a691d4c25c6d629a111c465577f5b662affd..b6512e20ff2b3cc3cf417efbd2298cb7d55cfe33 100644
--- a/src/feedback-vector-inl.h
+++ b/src/feedback-vector-inl.h
@@ -98,11 +98,6 @@ int FeedbackVector::invocation_count() const {
   return Smi::cast(get(kInvocationCountIndex))->value();
 }
 
-void FeedbackVector::increment_invocation_count() {
-  int count = invocation_count() + 1;
-  if (Smi::IsValid(count)) set(kInvocationCountIndex, Smi::FromInt(count));
-}
-
 void FeedbackVector::clear_invocation_count() {
   set(kInvocationCountIndex, Smi::kZero);
 }