RFR: 8290333: Remove os_share_*.hpp

[Ioi Lam]

Please remove this trivial change. Although many files are changed, I am only removing unused files and changing a couple of comments.

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Commit messages:
 - 8290333: Remove os_share_*.hpp

Changes: https://git.openjdk.org/jdk/pull/9506/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=9506&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8290333
  Stats: 156 lines in 21 files changed: 0 ins; 154 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/9506.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/9506/head:pull/9506

PR: https://git.openjdk.org/jdk/pull/9506