RFR: JDK-8291974 PrivateCredentialPermission should not use local variable to enable debugging [v3]

[Mark Powers]

> https://bugs.openjdk.org/browse/JDK-8291974

Mark Powers has updated the pull request incrementally with two additional commits since the last revision:

 - Text Blocks
 - long line

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/10206/files
  - new: https://git.openjdk.org/jdk/pull/10206/files/a8e304d1..304134d7

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=10206&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=10206&range=01-02

  Stats: 7 lines in 1 file changed: 6 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/10206.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/10206/head:pull/10206

PR: https://git.openjdk.org/jdk/pull/10206