[foreign-memaccess] [Rev 01] RFR: 8246053: Add a mask for default access modesAdd a default access mode flag

[Maurizio Cimadamore]

> This is a simple change which adds a 'default' access mask. This was pointed out during CSR review, and I realized that
> many tests were also using it. It can also be handy when creating more restricted masks (e.g. start with default and
> remove one or two access modes).
> I've updated tests, documentation and some of the impl to use the new mask accordingly.

Maurizio Cimadamore has updated the pull request incrementally with one additional commit since the last revision:

  Tweak name for new constant

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Changes:
  - all: https://git.openjdk.java.net/panama-foreign/pull/188/files
  - new: https://git.openjdk.java.net/panama-foreign/pull/188/files/0d191737..7aec8832

Webrevs:
 - full: https://webrevs.openjdk.java.net/panama-foreign/188/webrev.01
 - incr: https://webrevs.openjdk.java.net/panama-foreign/188/webrev.00-01

  Stats: 29 lines in 6 files changed: 0 ins; 0 del; 29 mod
  Patch: https://git.openjdk.java.net/panama-foreign/pull/188.diff
  Fetch: git fetch https://git.openjdk.java.net/panama-foreign pull/188/head:pull/188

PR: https://git.openjdk.java.net/panama-foreign/pull/188