WIP: Use MethodByName only with constants

[justinsb]

We would like to enable dead-code-elimination, as unblocked by https://go-review.googlesource.com/c/go/+/522436

[k8s-ci-robot]

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[k8s-ci-robot]

@justinsb: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-kops-test	1c44642	link	true	/test pull-kops-test
pull-kops-e2e-k8s-aws-amazonvpc	1c44642	link	true	/test pull-kops-e2e-k8s-aws-amazonvpc
pull-kops-e2e-k8s-aws-calico	1c44642	link	true	/test pull-kops-e2e-k8s-aws-calico
pull-kops-e2e-k8s-gce-ipalias	1c44642	link	true	/test pull-kops-e2e-k8s-gce-ipalias
pull-kops-e2e-k8s-gce-cilium	1c44642	link	true	/test pull-kops-e2e-k8s-gce-cilium

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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[k8s-ci-robot]

PR needs rebase.

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