[heap] Set progress bar flag for FixedArray upon allocation

test/cctest/heap/test-lab.cc

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <vector>
 
 #include "src/globals.h"
 #include "src/heap/heap.h"
 #include "src/heap/spaces.h"
 #include "src/heap/spaces-inl.h"
 // FIXME(mstarzinger, marja): This is weird, but required because of the missing
 // (disallowed) include: src/heap/incremental-marking.h -> src/objects-inl.h
 #include "src/objects-inl.h"
 #include "test/cctest/cctest.h"
 
 namespace v8 {
 namespace internal {
 
 static Address AllocateLabBackingStore(Heap* heap, intptr_t size_in_bytes) {
   AllocationResult result = heap->old_space()->AllocateRaw(
       static_cast<int>(size_in_bytes), kDoubleAligned);
-  Object* obj = result.ToObjectChecked();
-  Address adr = HeapObject::cast(obj)->address();
+  Address adr = result.ToObjectChecked()->address();
   return adr;
 }
 
 
 static void VerifyIterable(v8::internal::Address base,
                            v8::internal::Address limit,
                            std::vector<intptr_t> expected_size) {
   CHECK_LE(reinterpret_cast<intptr_t>(base), reinterpret_cast<intptr_t>(limit));
   HeapObject* object = nullptr;
   size_t counter = 0;
@@ skipping 245 matching lines @@
         break;
       }
     }
   }
   VerifyIterable(base, limit, expected_sizes);
 }
 #endif  // V8_HOST_ARCH_32_BIT
 
 }  // namespace internal
 }  // namespace v8