[foreign-memaccess+abi] RFR: Tweak support for restricted methods

[Maurizio Cimadamore]

On Mon, 25 Sep 2023 10:46:01 GMT, Maurizio Cimadamore <mcimadamore at openjdk.org> wrote:

> This patch addresses two issues:
> * The javadoc for all restricted methods includes a sentence which states that developers should seek alternatives. This sentence is now removed.
> * As outlined [here](https://bugs.openjdk.org/browse/JDK-8307341), the warning message for restricted method calls should include the caller class name (where possible) and an additional lines about restricted method warnings turning into errors at some point in the future.

src/java.base/share/classes/java/lang/Module.java line 324:

> 322:                 String mod = isNamed() ? "module " + getName() : "an unnamed module";
> 323:                 String modflag = isNamed() ? getName() : "ALL-UNNAMED";
> 324:                 String caller = currentClass != null ?

There are cases where the caller class might be null (e.g. when a restricted method is called by a native method that is attached to the JVM). In such cases we omit the "by" section.

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PR Review Comment: https://git.openjdk.org/panama-foreign/pull/896#discussion_r1335715519