Fix CoreLib extern modifier ordering

[Copilot]

Reorders CoreLib safety modifiers from safe extern/unsafe extern to extern safe/extern unsafe, satisfying IDE0036 and restoring macOS ARM64 builds.

• Fixes main is failing to build on osx-arm64 #132238

[Copilot]

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[EgorBo]

@copilot where are the changes?

[Copilot]

@copilot where are the changes?

Fixed and pushed in eec38c7. Checked CoreLib builds cleanly with 0 warnings/errors.

[Copilot]

Pull request overview

Copilot reviewed 10 out of 10 changed files in this pull request and generated no new comments.

[EgorBo]

@copilot plz fix AddUnsafeToExternCodeFixProvider.cs and AddUnsafeToExternCodeFixTests.cs as well.

[EgorBo]

@copilot plz fix AddUnsafeToExternCodeFixProvider.cs and AddUnsafeToExternCodeFixTests.cs as well.

[Copilot]

@copilot plz fix AddUnsafeToExternCodeFixProvider.cs and AddUnsafeToExternCodeFixTests.cs as well.

Fixed in 2d46b3f. The code fix now emits extern unsafe/extern safe; all 12 targeted tests pass.

[Copilot]

Pull request overview

Copilot reviewed 13 out of 13 changed files in this pull request and generated no new comments.

Suppressed comments (1)

src/tools/illink/src/ILLink.CodeFix/UnsafeModifierCodeFixHelpers.cs:274

• AddModifier(SyntaxTokenList ...) still inserts the safety modifier before extern when insertAfterModifier is left as the default (SyntaxKind.None). That means other code fixes that reuse this helper without specifying insertAfterModifier can still generate unsafe extern / safe extern and reintroduce IDE0036-style modifier ordering problems (the same class of issue this PR is addressing for CoreLib).

Consider treating extern as a special case in the default insertion logic (insert after extern when present), while keeping the existing partial behavior for non-extern declarations.

                // 'extern' and 'partial' conventionally sit closest to the return type, so the safety modifier goes
                // before them. Otherwise it is appended, which matches the repo's preferred modifier order where
                // 'unsafe' follows 'virtual', 'abstract', 'sealed' and 'override'.
                insertionIndex = GetFirstModifierIndex(modifiers, SyntaxKind.ExternKeyword, SyntaxKind.PartialKeyword);
            }

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