[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

--- Comment #14 from github-bugzilla at puremagic.com ---
Commit pushed to master at https://github.com/D-Programming-Language/dmd

https://github.com/D-Programming-Language/dmd/commit/23748b988fe60b2f6ab697c482afe9511d3f444a
Add -boundscheck=[on|safeonly|off] option

Replaces -noboundscheck (which becomes deprecated)

Fixes issue #12550

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