[Rev 01] RFR: 8237359: Clean up Binding

[Jorn Vernee]

> Continuation of: https://mail.openjdk.java.net/pipermail/panama-dev/2020-February/007417.html
> 
>> Hi,
>> 
>> Please review the following patch that does a few cleanups of the 
>> Binding class implementation:
>> - Adds javadoc
>> - Uses static factory methods instead of raw constructors. This allows 
>> returning singletons for some of the operators for instance.
>> - Constructing a COPY_BUFFER binding now requires a MemoryLayout, 
>> instead of a separate size & alignment. This was easier given the use-cases.
>> - Binding.AllocateBuffer renamed to Binding.Allocate (since we already 
>> had Copy as well).
>> - BoxAddress renamed to ConvertAddress, as a more general name to 
>> describe the boxing & unboxing that can occur. Suggested by Maurizio.
>> 
>> Webrev: 
>> http://cr.openjdk.java.net/~jvernee/panama/webrevs/cleanup_bindings/webrev.00/
>> Bugs: https://bugs.openjdk.java.net/browse/JDK-8237359, 
>> https://bugs.openjdk.java.net/browse/JDK-8238227, 
>> https://bugs.openjdk.java.net/browse/JDK-8238235
>> 
>> This patch take care of several smaller issues all at once. It applies 
>> on top of the JDK-8237360 patch.
>> 
>> Thanks,
>> Jorn

The pull request has been updated with 1 additional commit.

-------------

Added commits:
 - 4bf3e593: Address review comments:

Changes:
  - all: https://git.openjdk.java.net/panama-foreign/pull/12/files
  - new: https://git.openjdk.java.net/panama-foreign/pull/12/files/40562472..4bf3e593

Webrevs:
 - full: https://webrevs.openjdk.java.net/panama-foreign/12/webrev.01
 - incr: https://webrevs.openjdk.java.net/panama-foreign/12/webrev.00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/panama-foreign/pull/12.diff
  Fetch: git fetch https://git.openjdk.java.net/panama-foreign pull/12/head:pull/12

PR: https://git.openjdk.java.net/panama-foreign/pull/12