[foreign-preview] RFR: 8280527: Move jdk.incubator.foreign to java.lang.foreign

[Julia Boes]

On Tue, 25 Jan 2022 12:23:41 GMT, Maurizio Cimadamore <mcimadamore at openjdk.org> wrote:

>> To prepare for preview, this change removes the jdk.incubator.foreign module and moves the public classes to java.base/java.lang.foreign, implementation classes to java.base/jdk.internal.foreign respectively. 
>> 
>> While here, `SystemLookup` is replaced with the method `ClassLoader::findNative` and the methods in `MemoryHandles` are moved to `MethodHandles`. The `@PreviewFeature(feature=PreviewFeature.Feature.FOREIGN)` annotation and the `--enable-preview` flag are added were needed.
>
> src/hotspot/share/prims/scopedMemoryAccess.cpp line 173:
> 
>> 171: 
>> 172: #undef CC
>> 173: #undef FN_PTR
> 
> Since we're here (but it's ok if we defer it to another PR) we could get rid of the trailing exception parameter in `ScopedMemoryAccess_closeScope`. This was used in a previous iteration of the implementation, but now it's just an unused parameter.

Will address this in https://bugs.openjdk.java.net/browse/JDK-8280596

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PR: https://git.openjdk.java.net/panama-foreign/pull/633