RFR: 8261478: InstanceKlass::set_classpath_index does not match comments

[Yumin Qi]

On Mon, 24 May 2021 18:42:25 GMT, Calvin Cheung <ccheung at openjdk.org> wrote:

> A simple patch for updating the comment for the `InstanceKlass::set_classpath_index()` function.

LGTM. This is a leftover of JDK-8240204.

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Marked as reviewed by minqi (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/4170