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This changes the PoolAllocator to default the alignment to the given type. This makes the code simpler, and most importantly fixes a bug on ARM 32bit that caused OOM: The class CTxOut has a member CAmount which is an int64_t and on ARM 32bit int64_t are 8 byte aligned which is larger than the pointer alignment of 4 bytes. So for CCoinsMap to be able to use the pool, we need to use the alignment of the member instead of just alignof(void*).