cmd/compile: devirtualize interface calls with type assertions

[mateusz834]

This change adds support for #64824, which should
help with the new API added in #69521.

Fixes #64824
Updates #69521

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Patch Set 1:

This CL has failed the run. Reason:

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

---

• go on master (change 649195)

Build or test failure, click here for results.

To reproduce, try gomote repro 8723054805674185185.

Additional links for debugging:

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

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

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Error:

shard 4: failed to run compile goos:"aix" goarch:"ppc64" port: exit status 1
failed to run compile goos:"darwin" goarch:"amd64" port: exit status 1
failed to run compile goos:"darwin" goarch:"arm64" port: exit status 1
failed to run compile goos:"dragonfly" goarch:"amd64" port: exit status 1

Additional links for debugging:

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• Output for compile goos:"darwin" goarch:"amd64" port [shard 4]
• Output for compile goos:"darwin" goarch:"arm64" port [shard 4]
• Output for compile goos:"dragonfly" goarch:"amd64" port [shard 4]
• Shard 4 encountered a non-build/non-test failure, click here for the shard's build page

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This PR is being closed because golang.org/cl/649195 has been abandoned.

Going with CL 652036