[Issue 12550] Deprecate -noboundscheck and replace with more useful -boundscheck= option

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=12550

Gary Willoughby <dev at nomad.so> changed:

           What    |Removed                     |Added
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                 CC|                            |dev at nomad.so

--- Comment #1 from Gary Willoughby <dev at nomad.so> ---
IIRC Andrei has mentioned that bounds checking should be the default so the
flags must be for disabling this behaviour.

-noboundscheck=all
-noboundscheck=unsafe

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