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

Updates #69521
Fixes #64824

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Patch Set 2: Commit-Queue+1

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Patch Set 2: -Commit-Queue

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Patch Set 2:

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

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• Output for go tool dist test -json [shard 2]
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Patch Set 5:

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

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• Output for go tool dist test -json [shard 1]
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Patch Set 16: -Commit-Queue

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Patch Set 16:

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

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• Output for go tool dist test -json [shard 1]

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