[jdk11u-dev] RFR: 8212045: Add back the tests that were removed from HashesTest.java and AddExportsTest.java [v2]

[luchenlin]

> I backport this for parity with 11.0.20-oracle.

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

  update test case to fix fail

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

Changes:
  - all: https://git.openjdk.org/jdk11u-dev/pull/1905/files
  - new: https://git.openjdk.org/jdk11u-dev/pull/1905/files/10dbdf58..3b7bc045

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1905&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1905&range=00-01

  Stats: 11 lines in 1 file changed: 0 ins; 2 del; 9 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/1905.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/1905/head:pull/1905

PR: https://git.openjdk.org/jdk11u-dev/pull/1905