RFR: 8343039: Remove jdk.internal.misc.InternalLock and usages from java.io [v6]

[Brian Burkhalter]

> Uses of `InternalLock` are removed and `synchronized` is reinstated.

Brian Burkhalter has updated the pull request incrementally with one additional commit since the last revision:

  8343039: Remove java.base/jdk.internal.misc from @modules in test java/lang/ProcessBuilder/Basic.java

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Changes:
  - all: https://git.openjdk.org/jdk/pull/22048/files
  - new: https://git.openjdk.org/jdk/pull/22048/files/f5548c1b..2034b5db

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=22048&range=05
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=22048&range=04-05

  Stats: 1 line in 1 file changed: 0 ins; 1 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/22048.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22048/head:pull/22048

PR: https://git.openjdk.org/jdk/pull/22048