[in-place weak refs] Fix inconsistent MaybeObject function naming.

BUG=v8:7308

Change-Id: Ibbb224cc6be69f769158b3c1ea3411ceec8301a9
Reviewed-on: https://chromium-review.googlesource.com/968923Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Commit-Queue: Marja Hölttä <marja@chromium.org>
Cr-Commit-Position: refs/heads/master@{#52096}

src/feedback-vector-inl.h

@@ -126,7 +126,7 @@ Code* FeedbackVector::optimized_code() const {
 OptimizationMarker FeedbackVector::optimization_marker() const {
   MaybeObject* slot = optimized_code_weak_or_smi();
   Smi* value;
-  if (!slot->IsSmi(&value)) return OptimizationMarker::kNone;
+  if (!slot->ToSmi(&value)) return OptimizationMarker::kNone;
   return static_cast<OptimizationMarker>(value->value());
 }
 

src/objects/maybe-object-inl.h

@@ -11,7 +11,7 @@
 namespace v8 {
 namespace internal {
 
-bool MaybeObject::IsSmi(Smi** value) {
+bool MaybeObject::ToSmi(Smi** value) {
   if (HAS_SMI_TAG(this)) {
     *value = Smi::cast(reinterpret_cast<Object*>(this));
     return true;

src/objects/maybe-object.h

@@ -20,7 +20,7 @@ class Smi;
 class MaybeObject {
  public:
   bool IsSmi() const { return HAS_SMI_TAG(this); }
-  inline bool IsSmi(Smi** value);
+  inline bool ToSmi(Smi** value);
 
   bool IsClearedWeakHeapObject() {
     return ::v8::internal::IsClearedWeakHeapObject(this);