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

[Thomas Stuefe]

On Tue, 16 Nov 2021 07:41:00 GMT, David Holmes <dholmes at openjdk.org> wrote:

> Looks good and trivial.
> 
> Thanks, David

Thanks David.

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