RFR: 8335922: Incorrect @Stable usage of LambdaForm$Name.index

[Chen Liang]

On Mon, 15 Jul 2024 01:45:57 GMT, Chen Liang <liach at openjdk.org> wrote:

> The `@Stable` on the `index` field is incorrect, as stable only avoids inlining `0`. Solution is to use bit flip on the actual index (and rename the field to `flippedIndex`), so we use -1 to -256 (mapping to 0 to 255) and 0 the default value is used as an unset indicator.

Indeed, for some reason I thought the range of short is -256 to 255 instead of -65536 to 65535

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PR Comment: https://git.openjdk.org/jdk/pull/20178#issuecomment-2228389586