[Issue 15279] increase 256 switch case range limit

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=15279

Dennis <dkorpel at live.nl> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |dkorpel at live.nl
           Hardware|x86_64                      |All
            Summary|dchar is treated as char in |increase 256 switch case
                   |case range                  |range limit
                 OS|Linux                       |All
           Severity|normal                      |enhancement

--- Comment #2 from Dennis <dkorpel at live.nl> ---
You're hitting a limit that was set in place because the current implementation
doesn't scale well to larger ranges, see:
https://github.com/dlang/dmd/pull/12002

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