RFR: 8307553: Remove dead code MetaspaceClosure::push_method_entry

[Calvin Cheung]

On Fri, 5 May 2023 19:00:05 GMT, Ioi Lam <iklam at openjdk.org> wrote:

> Please review this trivial change to remove dead code, which is unused since [JDK-8263002](https://bugs.openjdk.org/browse/JDK-8263002), when CDS method trampolines were removed.

LGTM.

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Marked as reviewed by ccheung (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/13842#pullrequestreview-1415404901