[turbofan] Remove redundant AllocationSiteData::IsFastLiteral.

R=jarin@chromium.org

Bug: v8:7790
Change-Id: Id057b31fca7db4c63ae3dd6bb111f8a7e5a1f78b
Reviewed-on: https://chromium-review.googlesource.com/1184925
Commit-Queue: Jaroslav Sevcik <jarin@chromium.org>
Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#55324}

src/compiler/js-heap-broker.cc

@@ -240,9 +240,8 @@ class AllocationSiteData : public HeapObjectData {
         GetPretenureMode(object_->GetPretenureMode()),
         nested_site(GET_OR_CREATE(nested_site)) {
     if (PointsToLiteral) {
-      IsFastLiteral = IsInlinableFastLiteral(
-          handle(object_->boilerplate(), broker->isolate()));
-      if (IsFastLiteral) {
+      if (IsInlinableFastLiteral(
+              handle(object_->boilerplate(), broker->isolate()))) {
         boilerplate = GET_OR_CREATE(boilerplate)->AsJSObject();
       }
     } else {
@@ -254,9 +253,6 @@ class AllocationSiteData : public HeapObjectData {
   bool const PointsToLiteral;
   PretenureFlag const GetPretenureMode;
   ObjectData* const nested_site;
-
-  // These are only valid if PointsToLiteral is true.
-  bool IsFastLiteral = false;
   JSObjectData* boilerplate = nullptr;
 
   // These are only valid if PointsToLiteral is false.
@@ -778,7 +774,7 @@ bool AllocationSiteRef::IsFastLiteral() const {
     return IsInlinableFastLiteral(
         handle(object<AllocationSite>()->boilerplate(), broker()->isolate()));
   } else {
-    return data()->AsAllocationSite()->IsFastLiteral;
+    return data()->AsAllocationSite()->boilerplate != nullptr;
   }
 }