RFR: 8304031: Classfile API cannot encode Primitive Class as Condy

[liach]

On Mon, 13 Mar 2023 08:13:44 GMT, liach <duke at openjdk.org> wrote:

> Without this patch, the Classfile API tries to encode PrimitiveClassDesc as CONSTANT_Class_info and error in `toInternalName`.

@asotona Would you mind review this?

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PR: https://git.openjdk.org/jdk/pull/12996