[Bug rust/108087] New: -Wodr warnings in rust/rust-lang.cc (lang_type)

["sam at gentoo dot org" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108087

            Bug ID: 108087
           Summary: -Wodr warnings in rust/rust-lang.cc (lang_type)
           Product: gcc
           Version: 13.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: rust
          Assignee: unassigned at gcc dot gnu.org
          Reporter: sam at gentoo dot org
                CC: dkm at gcc dot gnu.org, gcc-rust at gcc dot gnu.org
  Target Milestone: ---

Created attachment 54082
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=54082&action=edit
build.log.xz (slightly past warning)

Noticed when bootstrapping GCC 13 from trunk at r13-4681-g531ca06c007d4c.
```
/var/tmp/portage/sys-devel/gcc-13.0.9999/work/gcc-13.0.9999/gcc/rust/rust-lang.cc:67:17:
warning: type [-Wodr]
   67 | struct GTY (()) lang_type
      |                 ^
/var/tmp/portage/sys-devel/gcc-13.0.9999/work/gcc-13.0.9999/gcc/rust/backend/rust-tree.h:234:
note: a different type is defined in another translation unit
  234 | struct GTY (()) lang_type
      |
/var/tmp/portage/sys-devel/gcc-13.0.9999/work/gcc-13.0.9999/gcc/rust/backend/rust-tree.h:236:
note: the first difference of corresponding definitions is field ‘align’
  236 |   unsigned char align;
      |
/var/tmp/portage/sys-devel/gcc-13.0.9999/work/gcc-13.0.9999/gcc/rust/backend/rust-tree.h:234:
note: a type with different number of fields is defined in another translation
unit
  234 | struct GTY (()) lang_type
      |
```

I've attached the build.log compressed a bit past the point of the warning, as
it's still building.

Host compiler is 12.2.1_p20221210.

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