[net8.0] added a test for blittability of pinvokes, partial #15684

[stephen-hawley]

This adds a unit test to check for blittability of arguments to pinvokes.

What's going on here?
Loop over every unit pinvoke and checks each arg and return value for blittability.
An argument is blittable if it's:

1. a type that we like
2. a pointer
3. a struct

a struct is blittable if all its non-static fields are blittable.

This test runs, but fails on about 1200 cases per platform. Most of these failures are with enums.

The rules might need to be adjusted to account for ref or out args and 1 dimensional arrays of blittables.

[github-actions]

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[rolfbjarne]

This test runs, but fails on about 1200 cases per platform. Most of these failures are with enums.

A quick test shows that enums are allowed: https://gist.github.com/rolfbjarne/716fcf0d8842639848fc0656bf3deac9

while ref/out/array types are not (see https://gist.github.com/rolfbjarne/6f9b252c84bf89d8770a6420cd56a4e5 for ref types).

[github-actions]

⚠️ Your code has been reformatted. ⚠️

If this is not desired, add the actions-disable-autoformat label, and revert the reformatting commit.

If files unrelated to your change were modified, try reverting the reformatting commit + merging with the target branch (and push those changes).

[vs-mobiletools-engineering-service2]

🌱 [CI Build] Test results 🌱

All tests have been skipped because the label 'skip-all-tests' was set.

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Hash: 17998ace9a49a02c1e17acb1407c1926668b5e1d [PR build]

[vs-mobiletools-engineering-service2]

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[vs-mobiletools-engineering-service2]

✅ API diff for current PR / commit

Legacy Xamarin (No breaking changes)

• iOS (no change detected)
• tvOS (no change detected)
• watchOS (no change detected)
• macOS (no change detected)

NET (empty diffs)

• iOS: (empty diff detected)
• tvOS: (empty diff detected)
• MacCatalyst: (empty diff detected)
• macOS: (empty diff detected)

❗ API diff vs stable (Breaking changes)

Legacy Xamarin (:heavy_exclamation_mark: Breaking changes :heavy_exclamation_mark:)

• iOS: vsdrops gist (:heavy_exclamation_mark: Breaking changes :heavy_exclamation_mark:)
• tvOS: vsdrops gist (No breaking changes)
• watchOS: vsdrops gist (No breaking changes)
• macOS: vsdrops gist (No breaking changes)

.NET (:heavy_exclamation_mark: Breaking changes :heavy_exclamation_mark:)

• iOS: vsdrops gist (:heavy_exclamation_mark: Breaking changes :heavy_exclamation_mark:)
• tvOS: vsdrops gist (No breaking changes)
• MacCatalyst: vsdrops gist (No breaking changes)
• macOS: vsdrops gist (No breaking changes)
• Microsoft.iOS vs Microsoft.MacCatalyst: vsdrops gist

Legacy Xamarin (stable) vs .NET

• iOS: vsdrops gist
• tvOS: vsdrops gist
• macOS: vsdrops gist

✅ Generator diff

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Pipeline on Agent
Hash: 17998ace9a49a02c1e17acb1407c1926668b5e1d [PR build]

[tj-devel709]

LGTM!