RFR: 8255035: Update BCEL to Version 6.5.0

[Lance Andersen]

On Thu, 6 May 2021 00:17:40 GMT, Joe Wang <joehw at openjdk.org> wrote:

> Update BCEL to the latest version (6.5.0). The majority of the changes were code refactoring (name format changes).
> 
> XML tests passed on both Linux and Windows.

Marked as reviewed by lancea (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/3893