RFR: 8343039: Remove jdk.internal.misc.InternalLock and usages from java.io [v7]

[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 failing getDeclaredField call from 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/2034b5db..0b68ed08

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=22048&range=06
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=22048&range=05-06

  Stats: 2 lines in 1 file changed: 0 ins; 2 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