RFR: 8256738: Compiler interface clean-up

[Claes Redestad]

On Fri, 20 Nov 2020 15:15:18 GMT, Nils Eliasson <neliasso at openjdk.org> wrote:

>> This patch removes dead code in the ci area.
>> 
>> There's also a trivial micro-optimization to is_boxing_method/is_unboxing_method
>
> Nice clean up!

@neliasso @vnkozlov @TobiHartmann - thank you for reviewing!

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PR: https://git.openjdk.java.net/jdk/pull/1345