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[Do not merge] Reduced test case for strange test crashes #630

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This is a very odd bug that is showing up in CI and on the command line, but not in Xcode with a similar toolchain selected. The GoodBadFunctionTests.swift file has a reduced test case that demonstrates the problem: With this code included, I see several other tests that crash, even in different test modules.

The problem disappears if you comment out the call to badFunction, but then re-appears if you make badFunction internal instead of fileprivate. I've been testing this with
swift-DEVELOPMENT-SNAPSHOT-2023-01-30-a.xctoolchain.

This is a very odd bug that is showing up in CI and on the command
line, but not in Xcode with a similar toolchain selected. The
`GoodBadFunctionTests.swift` file has a reduced test case that
demonstrates the problem: With this code included, I see several
_other_ tests that crash, even in different test modules.

The problem disappears if you comment out the call to `badFunction`,
but then re-appears if you make `badFunction` internal instead of
fileprivate. I've been testing this with
`swift-DEVELOPMENT-SNAPSHOT-2023-01-30-a.xctoolchain`.
@natecook1000
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@swift-ci Please test

@shahmishal
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@swift-ci test Windows

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