[foreign-memaccess+abi] RFR: 8263459: Add better support for restricted methods [v6]

[Athijegannathan Sundararajan]

> When a Panama native restricted method is called, we will no require that the caller module (which could be ALL-UNNAMED) has been whitelisted accordingly, on the command line, using this flag:
> 
> --enable-native-access=<modulename>
> 
> In other words, this work replaces the hacky -Dforeign.restricted=permit property with a system which works in tandem with the Java module system.
> 
> The current PR includes subset of the earlier PR 
> 
> https://github.com/openjdk/panama-foreign/pull/471
> 
> The 'fail fast' aspect (jlink plugin to mark "NativeAccess" calling modules and issuing error if those modules were not mentioned in --enable-native-access) has been removed in this new PR.

Athijegannathan Sundararajan has updated the pull request incrementally with one additional commit since the last revision:

  removed @NativeAccess for a non-API method. Added missing @NativeAccess for an API method.

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

Changes:
  - all: https://git.openjdk.java.net/panama-foreign/pull/472/files
  - new: https://git.openjdk.java.net/panama-foreign/pull/472/files/6bca7fa3..35fd3295

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=panama-foreign&pr=472&range=05
 - incr: https://webrevs.openjdk.java.net/?repo=panama-foreign&pr=472&range=04-05

  Stats: 3 lines in 2 files changed: 1 ins; 2 del; 0 mod
  Patch: https://git.openjdk.java.net/panama-foreign/pull/472.diff
  Fetch: git fetch https://git.openjdk.java.net/panama-foreign pull/472/head:pull/472

PR: https://git.openjdk.java.net/panama-foreign/pull/472