[jdk11u-dev] RFR: 8212045: Add back the tests that were removed from HashesTest.java and AddExportsTest.java

[luchenlin]

I backport this for parity with 11.0.20-oracle.

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Commit messages:
 - Backport 1226dcbcfe0d1c074d9b27c58d509bd73a138919

Changes: https://git.openjdk.org/jdk11u-dev/pull/1899/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1899&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8212045
  Stats: 58 lines in 2 files changed: 56 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/1899.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/1899/head:pull/1899

PR: https://git.openjdk.org/jdk11u-dev/pull/1899