RFR: 8309543: Micro-optimize x86 assembler UseCondCardMark

[Martin Doerr]

On Tue, 6 Jun 2023 14:24:14 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> Noticed this while explaining a related code: there is no need to make a full jump, and a short jump would suffice. Assembler does not know about this shortening, because it is a forward branch.
> 
> Makes a slightly more compact interpreter code.

Marked as reviewed by mdoerr (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/14335#pullrequestreview-1465600814