RFR: 8305142: Can't bootstrap ctw.jar

[Xin Liu]

This patch add a few add-exports so CTW can access those internal packages of java.base module.

make succeeds and ctw.jar is generated as expected.

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Commit messages:
 - 8305142: Can't bootstrap ctw.jar

Changes: https://git.openjdk.org/jdk/pull/13220/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=13220&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8305142
  Stats: 6 lines in 1 file changed: 5 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/13220.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13220/head:pull/13220

PR: https://git.openjdk.org/jdk/pull/13220