RFR: 8255883: Avoid multiple GeneratedMethodAccessor for same NativeMethod… [v2]

[Hui Shi]

On Tue, 10 Nov 2020 18:36:22 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

>> Hui Shi has refreshed the contents of this pull request, and previous commits have been removed. The incremental views will show differences compared to the previous content of the PR. The pull request contains one new commit since the last revision:
>> 
>>   8255883: Avoid multiple GeneratedAccessor for same NativeMethod/ConstructorAccessorImpl object
>
> Minor nits here.

@shipilev all comments are updated, please help review again!

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PR: https://git.openjdk.java.net/jdk/pull/1070