RFR: 8304283: Modernize the switch statements in jdk.internal.foreign [v2]

[Per Minborg]

On Wed, 15 Mar 2023 18:34:50 GMT, Maurizio Cimadamore <mcimadamore at openjdk.org> wrote:

>> Per Minborg has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Reintroduce missing comment
>
> src/java.base/share/classes/jdk/internal/foreign/abi/riscv64/linux/TypeClass.java line 112:
> 
>> 110:                     return flatten(sequenceLayout.elementLayout()).mul(elementCount);
>> 111:                 }
>> 112:                 case null, default -> throw new IllegalStateException("Cannot get here: " + layout);
> 
> Since the default throws, and the switch w/o a `case null` also throws, do we need the `case null` here?

No. Null is not needed. I will remove it.

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PR: https://git.openjdk.org/jdk/pull/13047