[Issue 19309] New: [Reg 2.080.0] Unicode char reference in a comment causes warning

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=19309

          Issue ID: 19309
           Summary: [Reg 2.080.0] Unicode char reference in a comment
                    causes warning
           Product: D
           Version: D2
          Hardware: x86_64
                OS: Linux
            Status: NEW
          Severity: regression
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: llucenic at gmail.com

Having a Unicode character reference, e.g. #x000D, in a comment block in D code
causes compiler warning

> C preprocessor directive `#%s` is not supported
secondarily causing compilation failure when using dub to build such a project.

Based on the instruction from Walter
(https://github.com/dlang/dmd/pull/7820#issuecomment-430420147), I am filling
this bug as a regression of DMD 2.080.0 caused by PR #7820. DMD 2.082.1 has
still got this regression (as of time of this writting).

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