[lworld] RFR: 8377328: [lworld] Remove legacy readme and classfile constants

[Chen Liang]

On Thu, 5 Feb 2026 23:20:02 GMT, Chen Liang <liach at openjdk.org> wrote:

> There is a legacy src/readme and legacy ACC_PRIMITIVE and Q descriptor left in classfile_constants.h.template. Let's remove all of them.

Thanks for the reviews!

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PR Comment: https://git.openjdk.org/valhalla/pull/2057#issuecomment-3874493859