[Issue 19404] New: Optimize std.string.stripRight

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=19404

          Issue ID: 19404
           Summary: Optimize std.string.stripRight
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P1
         Component: phobos
          Assignee: nobody at puremagic.com
          Reporter: n8sh.secondary at hotmail.com

`stripLeft` can entirely avoid decoding for wchar arrays and can benefit from
an ASCII fast path for char arrays.

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