[Issue 19308] New: Optimize std.string.stripLeft

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=19308

          Issue ID: 19308
           Summary: Optimize std.string.stripLeft
           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` has room for improvement by avoiding redundant decoding and adding
a proper fast path for ASCII.

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