[heap] MemoryAllocator: Use size_t consistently

src/heap/heap.cc

Index: src/heap/heap.cc
diff --git a/src/heap/heap.cc b/src/heap/heap.cc
index ac92f07a829785c384ae3faeb4d33073b855d5a5..66f9ba0943a1e05039d629cc7ecaf24289e85e41 100644
--- a/src/heap/heap.cc
+++ b/src/heap/heap.cc
@@ -1171,8 +1171,9 @@ bool Heap::ReserveSpace(Reservation* reservations, List<Address>* maps) {
         for (auto& chunk : *reservation) {
           AllocationResult allocation;
           int size = chunk.size;
-          DCHECK_LE(size, MemoryAllocator::PageAreaSize(
-                              static_cast<AllocationSpace>(space)));
+          DCHECK_LE(static_cast<size_t>(size),
+                    MemoryAllocator::PageAreaSize(
+                        static_cast<AllocationSpace>(space)));
           if (space == NEW_SPACE) {
             allocation = new_space()->AllocateRawUnaligned(size);
           } else {