cmd/compile/internal/devirtualize: improve concrete type analysis

[mateusz834]

This change improves the concrete type analysis in the devirtualizer,
it not longer relies on ir.Reassigned, it now statically tries to
determine the concrete type of an interface, even when assigned
multiple times, following type assertions and iface conversions.

Alternative to CL 649195

Fixes #64824

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Message from Mateusz Poliwczak:

Patch Set 2: Commit-Queue+1

(1 comment)

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Message from Go LUCI:

Patch Set 2:

Dry run: CV is trying the patch.

Bot data: {"action":"start","triggered_at":"2025-02-24T19:39:48Z","revision":"a2b90406da463d84f7606706a10c2e6372a13a95"}

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Message from Mateusz Poliwczak:

Patch Set 2: -Commit-Queue

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Message from Go LUCI:

Patch Set 2:

This CL has failed the run. Reason:

Tryjob golang/try/gotip-linux-amd64-newinliner has failed with summary (view all results):

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• go on master (change 652036)

Build or test failure, click here for results.

To reproduce, try gomote repro 8722024791248491105.

Additional links for debugging:

• Output for go tool dist test -json [shard 2]

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Message from Go LUCI:

Patch Set 2: LUCI-TryBot-Result-1

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Message from Mateusz Poliwczak:

Patch Set 3: Commit-Queue+1

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Message from Go LUCI:

Patch Set 3:

Dry run: CV is trying the patch.

Bot data: {"action":"start","triggered_at":"2025-02-24T19:56:59Z","revision":"9d69609570d77cc1942e98c4f1780198aaa7a364"}

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Message from Mateusz Poliwczak:

Patch Set 3: -Commit-Queue

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Message from Go LUCI:

Patch Set 3:

This CL has passed the run

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Message from Go LUCI:

Patch Set 3: LUCI-TryBot-Result+1

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Message from Keith Randall:

Patch Set 3:

(6 comments)

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