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)

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

  Review suggestions applied:
  Remove SecurityExceptions from LiveStackFrame
  Rename safeTrim to trimArray

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Changes:
  - all: https://git.openjdk.org/jdk/pull/22168/files
  - new: https://git.openjdk.org/jdk/pull/22168/files/6663749a..b873e116

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=22168&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=22168&range=00-01

  Stats: 20 lines in 2 files changed: 0 ins; 17 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/22168.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22168/head:pull/22168

PR: https://git.openjdk.org/jdk/pull/22168