[Migrated] debug_printf requires unsafe

Issue automatically imported from old repo: https://github.com/EmbarkStudios/rust-gpu/issues/997
Old labels: t: enhancement
Originally creatd by charles-r-earp on 2023-03-04T00:38:43Z

The debug_printf and debug_printfln macros generate an invocation of the asm macro, which requires an unsafe block. However, the macro appears to validate it's input, so it could potentially add the unsafe block to it's output. If there are still outstanding issues, perhaps a safety section could be added to the docs to reduce confusion? This is a really useful tool, and it seems strange to require unsafe just to debug stuff.

Comience con las definiciones de las macros debug_printf y debug_printfln y con la macro asm que invocan. Compruebe cómo se relaciona la validación de entrada con el requisito unsafe y determine después si completar el trabajo implica cambiar la invocación generada o documentar las expectativas de seguridad.