RFR: JDK-8301460: Clean up LambdaForm to reference BasicType enums directly [v2]

[Mandy Chung]

On Tue, 14 Feb 2023 10:50:12 GMT, Jorn Vernee <jvernee at openjdk.org> wrote:

>> Mandy Chung has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains three additional commits since the last revision:
>> 
>>  - Merge branch 'master' of https://github.com/openjdk/jdk into JDK-8301460
>>  - further clean up
>>  - JDK-8301460: Code in LambdaForm.java still refers to resolved JDK-8161245
>
> src/java.base/share/classes/java/lang/invoke/BoundMethodHandle.java line 371:
> 
>> 369:             extensions[typeNum] = sd;
>> 370:             return sd;
>> 371:         }
> 
> I suggest changing the existing overload to delegate to this one with `BasicType.basicType(typeNum)` as the argument. (or to use some other way to reduce the duplication)

I further cleaned this up.  `extendWith(byte typeNum)` is now removed.

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PR: https://git.openjdk.org/jdk/pull/12546