`runtime-coreclr ilasm` pipeline failures

[am11]

The runtime-coreclr ilasm pipeline has been failing since Jan 31.

The failures can be traced to changes in this range:
2772854...912f1e2

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[am11]

@jkoritzinsky, I think it would make sense to get a green (or near-green) pipeline before we add <UseManagedIlasm> infra for additional test execution (re #124600).