Use clang's inline assembly support to wrap eZ80 LDIR directly

inlineldir.h

/**
 * Wraps eZ80 LDIR instruction.
 * @param destination Target address, e.g. &somearr[i - 2]
 * @param source Source address, e.g. &somearr[i]
 * @param count Number of bytes to move
 * @example #define VRAM ((uint16_t*)0xD40000)
 * *VRAM = 12345; // Set first word of VRAM
 * _ldir(VRAM+1, VRAM, LCD_WIDTH * LCD_HEIGHT - 1); // Copy remaining pixels with LDIR
 */
static inline void _ldir(void* destination, const void* source, size_t count)
{
    if (count)
        __asm__("ldir"
            :
            : "l"(source), "e"(destination), "c"(count)
            : "a", "cc"
            );
}