[Issue 14010] Support mangleof property for opaque enum and struct type

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=14010

--- Comment #4 from github-bugzilla at puremagic.com ---
Commit pushed to master at https://github.com/D-Programming-Language/dmd

https://github.com/D-Programming-Language/dmd/commit/a080c8b3242c27efe07325b1c5ddfacb998d4e99
Move issue 12543 & 14010 test case to compilable/testfwdref.d

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