Removed old debug printfs in std.string

[JackStouffer]

Continuation of #5180

[dlang-bot]

Thanks for your pull request, @JackStouffer!

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[quickfur]

LGTM, thanks for cleaning up dead code!

[wilzbach]

FWIW: we could do the same for writeln and use assumeNoGC + catch all Exceptions - it would be very, very handy for debugging. Hell, we could only version it with version(debug) ...

[JackStouffer]

debug statements already bypass the @nogc and pure attributes IIRC

[PetarKirov]

No, they only bypass pure.

[wilzbach]

@JackStouffer I just noticed that there are a lot more of these old debug printfs hidden in Phobos.
Just run sth. like grep -ir "debug(.*) "
Do you plan to remove them as well?
Or in other words, have at least a look at these files ;-)

• std.array
• std.bitmanip
• std.format
• std.utf