interface determinism: Non-deterministic list of constructors

Since we've beefed up the determinism ABI test in !12680 (merged), more non-deterministic differences in interface files were exposed.

In particular, it looks like a re-export such as `TestInstance (..)` will list the constructors for the type non deterministically:

diff -r out/run1/tmp/Distribution/TestSuite.hi out/run2/tmp/Distribution/TestSuite.hi
1932c1932
<            [TestInstance{TestInstance, TestInstance, run, tags, name, options,
---
>            [TestInstance{TestInstance, TestInstance, run, name, tags, options,

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