[Issue 23471] New: undocumented dmd CLI options

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=23471

          Issue ID: 23471
           Summary: undocumented dmd CLI options
           Product: D
           Version: D2
          Hardware: x86
                OS: Windows
            Status: NEW
          Severity: enhancement
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: nick at geany.org

-multiobj, -nofloat, -vcg-ast are not documented.

There should also be a debug test to help detect undocumented options.

PR incoming.

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