[heap] Prepare code for smaller large object allocation limit than max allocatable memory.

test/cctest/test-spaces.cc

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 408 matching lines @@
   CHECK(compaction_space != NULL);
   CHECK(compaction_space->SetUp());
 
   OldSpace* old_space = new OldSpace(heap, OLD_SPACE, NOT_EXECUTABLE);
   CHECK(old_space != NULL);
   CHECK(old_space->SetUp());
 
   // Cannot loop until "Available()" since we initially have 0 bytes available
   // and would thus neither grow, nor be able to allocate an object.
   const int kNumObjects = 100;
-  const int kExpectedPages = kNumObjects;
+  const int kExpectedPages = (kNumObjects / (compaction_space->AreaSize() /
+                                             Page::kMaxRegularHeapObjectSize));
   for (int i = 0; i < kNumObjects; i++) {
     compaction_space->AllocateRawUnaligned(Page::kMaxRegularHeapObjectSize)
         .ToObjectChecked();
   }
   int pages_in_old_space = old_space->CountTotalPages();
   int pages_in_compaction_space = compaction_space->CountTotalPages();
   CHECK_EQ(pages_in_compaction_space, kExpectedPages);
   CHECK_LE(pages_in_old_space, 1);
 
   old_space->MergeCompactionSpace(compaction_space);
@@ skipping 194 matching lines @@
 
       // Turn the allocation into a proper object so isolate teardown won't
       // crash.
       HeapObject* free_space = NULL;
       CHECK(allocation.To(&free_space));
       new_space->heap()->CreateFillerObjectAt(free_space->address(), 80);
     }
   }
   isolate->Dispose();
 }