RFR: JDK-8277172: Remove stray comment mentioning instr_size_for_decode_klass_not_null on x64

[David Holmes]

On Mon, 15 Nov 2021 09:03:58 GMT, Thomas Stuefe <stuefe at openjdk.org> wrote:

> Trivial cleanup.
> 
> https://bugs.openjdk.java.net/browse/JDK-8241825 removed `instr_size_for_decode_klass_not_null()` on x64 but left a comment in place. Remove obsolete comment.

Looks good and trivial.

Thanks,
David

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Marked as reviewed by dholmes (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/6384