Method validate

src/common/classes/alloc.cpp:650–658

	}

	void validate(MemPool* pool, StatInt& vMap, StatInt& vUse)
	{
		SemiDoubleLink::validate(this);
		block->assertBig();
		fb_assert(block->getSize() + hdrSize() == length);

		vMap += FB_ALIGN(length, get_map_page_size());
		block->validate(pool, vUse);
	}
};