Fix missed case of COOP to PREEMPT transition

[davidwrighton]

Fixes #131435

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This PR description was generated with GitHub Copilot CLI.

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[janvorli]

LGTM, thank you!

[davidwrighton]

/azp list

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[Copilot]

Pull request overview

This PR adjusts the CoreCLR interpreter’s delegate-invoke slow path to ensure the COOP→PREEMPT transition happens before calling APIs that may require preemptive mode (notably via GetMultiCallableAddrOfCode → MethodDesc::GetTemporaryEntryPoint).

Changes:

• Introduces InvokeDelegateInvokeMethodHelper to wrap GetMultiCallableAddrOfCode(...) + stub update under GCX_PREEMP().
• Updates InvokeDelegateInvokeMethod to use the helper when the cached call stub template is missing.

[davidwrighton]

/azp run runtime-interpreter

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[Copilot]

Pull request overview

Copilot reviewed 1 out of 1 changed files in this pull request and generated no new comments.

[davidwrighton]

/ba-g This might have regressed 1 gc test, but the fundamental failure is fixed, and if the test is failing due to this fuc, it's the test that needs to be fixed.