[Issue 18220] New: Allow trapexception to be set from the CLI

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18220

          Issue ID: 18220
           Summary: Allow trapexception to be set from the CLI
           Product: D
           Version: D2
          Hardware: x86_64
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P1
         Component: druntime
          Assignee: nobody at puremagic.com
          Reporter: greensunny12 at gmail.com

http://arsdnet.net/this-week-in-d/2016-aug-07.html

> Hopefully, druntime will expose this variable in a more easier way in the future. Currently, on Windows, it is automatically set if a debugger is detected, but on Linux, debugger detection is quite a bit harder and hackier, so it might not happen any time soon. Druntime could (and should!) also potentially offer it as a command line switch, like it does with GC profiling now.

> DRUNTIME DEVS: if you read this, make it happen!

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