[Issue 23304] New: Add core.bitops.ReverseBitRange

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=23304

          Issue ID: 23304
           Summary: Add core.bitops.ReverseBitRange
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P1
         Component: druntime
          Assignee: nobody at puremagic.com
          Reporter: keivan.shah at silverleafcaps.com

This complements the BitRange in core.bitops. 

Useful when you want to traverse the bitset in reverse without having to
reverse the underlying bitset.

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