[Issue 23370] New: std.base64 can have more @nogc functions

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=23370

          Issue ID: 23370
           Summary: std.base64 can have more @nogc functions
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P1
         Component: phobos
          Assignee: nobody at puremagic.com
          Reporter: jack at jackstouffer.com

The decoding functions in std.base64 would be automatically marked as @nogc if
the functions decodeLength and realDecodeLength were marked @nogc.

--