Class FL_ALIGNAS

src/platforms/arm/lpc/rx_sct_capture.cpp.hpp:275–275

// alignment slack = 512 bytes) — DMA->SRAMBASE only accepts the table
// base, not a slice.
struct FL_ALIGNAS(16) DmaDescriptor {
    fl::u32 reserved;
    fl::u32 src_end_addr;
    fl::u32 dst_end_addr;