RFR: 8254559: Remove unimplemented JVMFlag::get_locked_message_ext

[Aleksey Shipilev]

On Mon, 12 Oct 2020 07:33:44 GMT, Thomas Schatzl <tschatzl at openjdk.org> wrote:

>> The definition was removed with JDK-8224599, the declaration was left behind.
>> 
>> Testing:
>>  - [x] Linux x86_64 build
>>  - [x] Text search for `get_locked_message_ext` in entire `src/`
>
> Marked as reviewed by tschatzl (Reviewer).

Thanks!

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PR: https://git.openjdk.java.net/jdk/pull/598