RFR: 8264696: Multi-catch clause causes compiler exception because it uses the package-private supertype [v2]

[Guoxiong Li]

> Hi all,
> 
> The method `isAccessible(Env<AttrContext> env, Type t, boolean checkInner)` should take `UnionClassType` as a special type to do some corresponding work. If not, the problem will occur. This patch fixes it and adds a test case.
> 
> Thank you for taking the time to review.
> 
> Best Regards.
> -- Guoxiong

Guoxiong Li has updated the pull request incrementally with two additional commits since the last revision:

 - Use stream api
 - Remove writeAll()

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

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/3374/files
  - new: https://git.openjdk.java.net/jdk/pull/3374/files/2e0dba0f..d6a8b12e

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=3374&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=3374&range=00-01

  Stats: 11 lines in 2 files changed: 2 ins; 5 del; 4 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3374.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3374/head:pull/3374

PR: https://git.openjdk.java.net/jdk/pull/3374