[Issue 19405] New: Improve backwards UTF-8 decoding in stripRight

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=19405

          Issue ID: 19405
           Summary: Improve backwards UTF-8 decoding in 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

The backwards UTF-8 decoding in stripRight can be substantially sped up. With
the improvements it also becomes faster than foreach_reverse(dchar c; s) for
strings, so we can use it for strings and make them `@nogc` nothrow.

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