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

[Jorn Vernee]

On Mon, 13 Feb 2023 22:05:15 GMT, Mandy Chung <mchung at openjdk.org> wrote:

> `LambdaForm` declares int constants for `BasicType::ordinal` to workaround JDK-8161245.   Now these int constants are no longer needed.    This removes these int constants and reference `BasicType` enums directly.

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)

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