pushed: [RFA/DWARF] Set enum type "flag_enum" and "unsigned" flags at type creation.

[Joel Brobecker]

> gdb/ChangeLog:
> 
>         * dwarf2read.c (update_enumeration_type_from_children): New
>         function, mostly extracted from process_structure_scope.
>         (read_enumeration_type): Call update_enumeration_type_from_children.
>         (process_enumeration_scope): Do not set THIS_TYPE's flag_unsigned
>         and flag_flag_enum fields.
> 
> gdb/testsuite/ChangeLog:
> 
>         * gdb.dwarf2/arr-subrange.c, gdb.dwarf2/arr-subrange.exp: New files.

Retested on x86_64-linux and pushed.

-- 
Joel
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