RFR: 8304918: Remove unused decl field from AnnotatedType implementations

[Chen Liang]

On Sat, 25 Mar 2023 05:52:44 GMT, Chen Liang <liach at openjdk.org> wrote:

> In `AnnotatedTypeBaseImpl`, a `decl` field is declared, referring to the declaration that the AnnotatedType is from. However, this field is not used anywhere except passing to constructors of other implementations; it's not used in debug messages (unlike in `TypeAnnotation`), not involved in equality checks. Since these implementations are not serializable, we can safely remove the decl field from the implementations. All 1048 java/lang tests pass on my machine.

keep-alive.

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PR Comment: https://git.openjdk.org/jdk/pull/13183#issuecomment-1520877585