go/types: propagate *ast.LabeledStmt in blockBranches properly

[mateusz834]

Fixes #70974

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Patch Set 1:

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Message from Mateusz Poliwczak:

Patch Set 1: Commit-Queue+1

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Patch Set 1:

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Patch Set 1: -Commit-Queue

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Patch Set 1:

This CL has failed the run. Reason:

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

---

• go on master (change 638257)

Build or test failure, click here for results.

To reproduce, try gomote repro 8727732145496701489.

Additional links for debugging:

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

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Patch Set 1: LUCI-TryBot-Result-1

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Message from Mateusz Poliwczak:

Patch Set 2: Commit-Queue+1

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Patch Set 2:

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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-windows-386 has failed with summary (view all results):

---

• go on master (change 638257)

Build or test failure, click here for results.

To reproduce, try gomote repro 8727730884717205777.

Additional links for debugging:

• Output for go tool dist test -json [shard 4]

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Patch Set 2: LUCI-TryBot-Result-1

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Message from Mateusz Poliwczak:

Patch Set 2: Commit-Queue+1

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Dry run: CV is trying the patch.

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Patch Set 2: -Commit-Queue

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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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Patch Set 3:

Dry run: CV is trying the patch.

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Message from Mateusz Poliwczak:

Patch Set 3: -Commit-Queue

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Patch Set 3:

This CL has passed the run

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Patch Set 3: LUCI-TryBot-Result+1

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