[foreign-memaccess+abi] RFR: 8292918: Split FunctionDescriptor into an interface and implementation(s) [v2]

[Per Minborg]

On Fri, 26 Aug 2022 06:44:10 GMT, Athijegannathan Sundararajan <sundar at openjdk.org> wrote:

>> Per Minborg has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Relax parameter checking
>
> src/java.base/share/classes/jdk/internal/foreign/FunctionDescriptorImpl.java line 2:
> 
>> 1: /*
>> 2:  *  Copyright (c) 2020, 2022, Oracle and/or its affiliates. All rights reserved.
> 
> New source. No need for 2020

The code in this class is basically copied from the original FunctionalDescription concrete class from 2020 so I think 2020 can stay here.

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PR: https://git.openjdk.org/panama-foreign/pull/713