[testsuite] Require ucn support in gdc.test/compilable/ddoc12.d (PR d/88039)

[Rainer Orth]

Hi Mike,

> On Nov 27, 2018, at 2:18 AM, Rainer Orth <ro@CeBiTec.Uni-Bielefeld.DE> wrote:
>> 
>> Some assemblers, including the Solaris one, don't support UTF-8
>> identifiers, which breaks the gdc.test/compilable/ddoc12.d testcase as
>> reported in the PR.
>
> So, another style of fix, would be to change the binding from the language
> front-end to encode unsupported symbols using a fixed, documented, abi
> defined technique.

there's been some discussion on this in the PR.  Joseph's suggestion was
to follow the system compilers if this were done, and indeed they do
encode UTF-8 identifiers in some way which could either be
reverse-engineered or a spec obtained.  However, given Iain's stance
towards UTF-8 identifiers in D, I very much doubt this is worth the
effort.  Ultimately, it's his call, of course.

	Rainer

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Rainer Orth, Center for Biotechnology, Bielefeld University