RFR: 8357286: (bf) Remove obsolete instanceof checks in CharBuffer.append

[Brian Burkhalter]

On Wed, 11 Jun 2025 07:37:35 GMT, Jaikiran Pai <jpai at openjdk.org> wrote:

> Hello Brian, it looks like the Basic.java test has caught a genuine issue with this change:

Which `Basic.java`? The `jdk_nio` tests all passed on Linux.

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PR Comment: https://git.openjdk.org/jdk/pull/25739#issuecomment-2963278033