RFR: 8265135: Reduce work initializing VarForms [v5]

[Mandy Chung]

On Wed, 14 Apr 2021 21:26:52 GMT, Claes Redestad <redestad at openjdk.org> wrote:

>> This patch reduces work done initializing VarForms - mostly observed when loading each VarHandle implementation class.
>> 
>> - Lazily resolve MemberNames.
>> - Streamline MethodType creation. This reduces the number of MethodTypes created. 
>> 
>> Net effect is a reduction in bytecode executed per VH class by 50-60%.
>
> Claes Redestad has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Add resolveOrNull for exploded MemberName

Marked as reviewed by mchung (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/3472