[Bug gdb/31237] [gdb, clang] FAIL: gdb.gdb/index-file.exp: gdb-index files are identical

["vries at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=31237

--- Comment #6 from Tom de Vries <vries at gcc dot gnu.org> ---
The cooked index consists of shards, and each shard has an address map, of type
addrmap_mutable.

The addr_mutable object supports overlapping insertion, but with
insertion-order specific results.

So, by changing the number of worker threads, we change the number of shards,
and consequently the CUs indexed by each shard, and consequently the sequence
of insertions into each per-shard address map.

This is fine for the non-overlapping cases, we'd expect the same collection of
<key,value> pairs, just distributed differently over the shards.

But for the overlapping case, that doesn't work.

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