[coreclr-interp] FEATURE_PORTABLE_ENTRYPOINTS for INTOP_CALL_HELPER_P_PA

[pavelsavara]

I hit this when my test code tried to create managed exception

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[Copilot]

Pull Request Overview

This PR adds support for FEATURE_PORTABLE_ENTRYPOINTS in the INTOP_CALL_HELPER_P_PA case of the CoreCLR interpreter. The change enables the interpreter to handle portable entry points by detecting when a helper function doesn't have a native entry point and redirecting to interpret the method instead of calling the native helper directly.

Key changes:

• Modified the INTOP_CALL_HELPER_P_PA case to check for portable entry points
• Added logic to redirect to interpreted method execution when a portable entry point is detected

[radekdoulik]

LGTM