Method getMaximumMapping

src/common/classes/alloc.h:99–99

	size_t getMaximumUsage() const noexcept { return mst_max_usage; }
	size_t getCurrentMapping() const noexcept { return mst_mapped.value(); }
	size_t getMaximumMapping() const noexcept { return mst_max_mapped; }

private:
	// Forbid copying/assignment