RFR: 8254776: Remove unimplemented LowMemoryDetector::check_memory_usage [v2]

[Chris Plummer]

On Mon, 19 Oct 2020 06:23:16 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

>> `LowMemoryDetector::check_memory_usage` seems declared but not implemented. Current history does not show any
>> definitions since the initial load. Can be removed.
>> Testing:
>>  - [x] Linux x86_64 build
>>  - [x] Test search for `check_memory_usage` in `src/hotspot`
>
> Aleksey Shipilev has updated the pull request with a new target base due to a merge or a rebase. The pull request now
> contains one commit:
>   8254776: Remove unimplemented LowMemoryDetector::check_memory_usage

Marked as reviewed by cjplummer (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/659