RFR: 8268725: jshell does not support the --enable-native-access option [v2]

[Jan Lahoda]

> Adding `--enable-native-access` option to JShell. Set as a parameter to the remote agent (`--enable-native-access=ALL-UNNAMED`), but not the compiler, as the compiler does not have this option.

Jan Lahoda has updated the pull request incrementally with one additional commit since the last revision:

  Including --enable-native-access in help

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/4810/files
  - new: https://git.openjdk.java.net/jdk/pull/4810/files/b9b69ec7..47f66e3c

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=4810&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=4810&range=00-01

  Stats: 2 lines in 1 file changed: 2 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/4810.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/4810/head:pull/4810

PR: https://git.openjdk.java.net/jdk/pull/4810