RFR: 8259583: Remove unused decode_env::_codeBuffer

Tue Jan 12 06:50:57 UTC 2021

On Mon, 11 Jan 2021 19:11:51 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> SonarCloud instance reports that decode_env::_codeBuffer field is not initialized in constructor. But really, the field is never used after [JDK-8222079](https://bugs.openjdk.java.net/browse/JDK-8222079).
> 
> Additional testing:
>  - [x] No grep hits for `_codeBuffer` in `src/`

Looks good and trivial.

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Marked as reviewed by thartmann (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/2034