RFR: 8313139: Redefine INTERNAL_VISIBILITY when on Windows [v2]

[Julian Waters]

> INTERNAL_VISIBILITY should check for the Operating System we are currently on and should be redefined as specified in the comment if we are on Windows (more OS conditions can be added later).
> 
> This change is part of [JDK-8288293](https://bugs.openjdk.org/browse/JDK-8288293), the preliminary phase of which is nearing completion. The changes here are somewhat minimal and hopefully not too disruptive

Julian Waters has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains two additional commits since the last revision:

 - Merge branch 'openjdk:master' into visibility
 - 8313139

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/15030/files
  - new: https://git.openjdk.org/jdk/pull/15030/files/fbd30faa..e9f86f78

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=15030&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=15030&range=00-01

  Stats: 2178 lines in 89 files changed: 1222 ins; 277 del; 679 mod
  Patch: https://git.openjdk.org/jdk/pull/15030.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15030/head:pull/15030

PR: https://git.openjdk.org/jdk/pull/15030