RFR: 8304743: Compile_lock and SystemDictionary updates

[Dean Long]

On Fri, 31 Mar 2023 13:23:31 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

> The SystemDictionary is updated and read under the Compile_lock but this is unnecessary because the table is a concurrent hashtable, and the lock doesn't really synchronize any other compilation state.  The lock may have protected other state that Dependencies used in the past but has been removed.   See discussion in CR for more information.
> Tested with tier1-8.

Is there a guarantee that any klasses the compiler found in the hierarchy are actually in the dictionary by the time the compiled code gets to execute?  If not, then we could have something like this fail?
`Class.forName(this.getClass().getName());`

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PR Comment: https://git.openjdk.org/jdk/pull/13270#issuecomment-1492632852