[Feature request] add naked attribute

[robinkrens]

Is it possible to add __attribute__(naked) functionality? I think this attribute is very useful in bare metal and embedded environments. Using this attribute now with void __attribute__((naked)) testfunc(void) {}
results in:

        pushw   %bp 
        movw    %sp,    %bp 
        subw    $2,     %sp 
        movw    $1,     -2(%bp)
        nop
        movw    %bp,    %sp 
        popw    %bp 
        pushw   %ss 
        popw    %ds 
        ret

Currently I'm calling the .s file, but it would be great if I can handle this all from .c files!
Using 6.3.0-20220528.21-ppa220529075~focal