RFR: JDK-8260222: remove unused _thread member SymbolTableLookup

[Aleksey Shipilev]

On Thu, 21 Jan 2021 14:00:43 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

>> The class SymbolTableLookup has an unused member _thread. This could be removed.
>> See also the related sonar finding (claiming an uninitialized field) :
>> 
>> https://sonarcloud.io/project/issues?id=jdk&open=AXaE0c2j8L9hkQskF8y_&resolved=false&types=BUG
>> 
>> Thanks, Matthias
>
> Looks good + trivial.

Gaaa! I should have checked before opening #2188 -- that one also removes another leftover.

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PR: https://git.openjdk.java.net/jdk/pull/2180