[PATCH] [D] Allow enum scopes to be looked up.

[Iain Buclaw]

Hi,

In D, all named enums are scoped (the C++ equivalent of enum class) so
they should be handled in the language-specific symbol lookup.
However so as to support D compilers that don't emit enums as
DW_AT_enum_class (currently none, but I'm will shortly be adding it to
gdc), need to make sure that proper a safeguard is in place.

Regards
Iain.
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