RFR: 8313435: Clean up unused default methods code [v5]

[David Holmes]

On Fri, 4 Aug 2023 14:17:06 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

> There's no ability to pre-check because we don't know how long the constant pool buffer is going to get until we generate the instructions that potentially add entries to the constant pool. Then we know.

Doesn't `assemble_method_error` know how much CP space will be needed for the instructions it will generate?

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PR Comment: https://git.openjdk.org/jdk/pull/15095#issuecomment-1667163274