Rollup merge of #111179 - Zalathar:sort-groups, r=Mark-Simulacrum

Fix instrument-coverage tests by using Python to sort instantiation groups

#110942 was intended to fix a set of `-Cinstrument-coverage` tests, but it ended up silently *breaking* those tests on Linux, for annoying reasons detailed at #111171.

Dealing with `diff --ignore-matching-lines` across multiple platforms has been such a hassle that I've instead written a simple Python script that can detect instantiation groups in the output of `llvm-cov show`, and sort them in a predictable order so that they can be used as snapshots for an ordinary invocation of `diff`.

This approach should be much less error-prone, because it can't accidentally ignore the wrong lines, and any unforeseen problems will tend to result in a Python exception or a failing diff.

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