test: fix error check messages for 2 types2 tests

[zacharyburkett]

Many compiler tests fail with -G=3 due to changes in error message format.
This commit fixes two of these tests, to ensure I am on the right track in review.

Updates #46447

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Message from Matthew Dempsky:

Patch Set 1: Run-TryBot+1 Trust+1

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Message from Zachary Burkett:

Patch Set 1:

(3 comments)

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Patch Set 1: TryBot-Result+1

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Message from Matthew Dempsky:

Patch Set 1:

(2 comments)

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This PR (HEAD: 0ed904b) has been imported to Gerrit for code review.

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Message from Zachary Burkett:

Patch Set 3:

(2 comments)

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Message from Matthew Dempsky:

Patch Set 3: Run-TryBot+1 Code-Review+2 Trust+1

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Patch Set 3:

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Patch Set 3: TryBot-Result+1

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Message from Robert Griesemer:

Patch Set 3: Code-Review+2

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This PR is being closed because golang.org/cl/323314 has been merged.