4009f2e7f0
PR debug/29436, c/32326
* tree.c (build_type_attribute_qual_variant): Refuse to make
a distinct copy of a struct/enum type. Use build_distinct_type_copy.
* doc/extend.texi (Type Attributes): Don't encourage people to add
attributes to struct/enum types in a typedef. Fix
transparent_union example.
* tree-inline.c (remap_type_1): Remove code that's redundant with
remap_type.
(build_duplicate_type): Set id.copy_decl.
* c-common.c (handle_transparent_union_attribute): Simplify logic.
From-SVN: r130297
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