This prefix isn't actually used and only adds noise, so remove it.
It may have been useful on Linux that makes a distinction between
/dev/ttyACM* and /dev/ttyUSB* but it isn't now. Also, it's unlikely that
the same vid/pid pair will be shared between an acm and usb driver
anyway.
The needed stack size is hard to determine by the compiler. It will try,
but will fail in many common cases. Therefore, the runtime will pick a
fixed stack size.
There is a tradeoff between avoiding stack overflows and wasting RAM.
This tradeoff depends on the application: some don't need large stack
sizes but do need a lot of memory, while others need deep stacks but
aren't so memory constrained. That's why I've added a flag to do this on
the command line: https://github.com/tinygo-org/tinygo/pull/3159
It may be reasonable to use a different stack size per chip, for example
chips with lots of RAM could default to a larger stack size. But I don't
think it's a good idea to do this per board.
This can be very useful for some purposes:
* It makes it possible to disable the UART in cases where it is not
needed or needs to be disabled to conserve power.
* It makes it possible to disable the serial output to reduce code
size, which may be important for some chips. Sometimes, a few kB can
be saved this way.
* It makes it possible to override the default, for example you might
want to use an actual UART to debug the USB-CDC implementation.
It also lowers the dependency on having machine.Serial defined, which is
often not defined when targeting a chip. Eventually, we might want to
make it possible to write `-target=nrf52` or `-target=atmega328p` for
example to target the chip itself with no board specific assumptions.
The defaults don't change. I checked this by running `make smoketest`
before and after and comparing the results.
