RFR: 8344336: SM cleanup of java.lang.System, Runtime, String, StackWalker [v2]

[Roger Riggs]

> Removed use of SecurityManager to check permissions.
> Relaxed defensive copying of byte arrays (due to lack of SM)
> 
> Refresh of PR#22168 Including review comments made there.

Roger Riggs has updated the pull request incrementally with one additional commit since the last revision:

  Remove latent permission and checkPermission.

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Changes:
  - all: https://git.openjdk.org/jdk/pull/22282/files
  - new: https://git.openjdk.org/jdk/pull/22282/files/d9b01840..a6e71664

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=22282&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=22282&range=00-01

  Stats: 16 lines in 1 file changed: 0 ins; 16 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/22282.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22282/head:pull/22282

PR: https://git.openjdk.org/jdk/pull/22282