RFR: 8360474: Add missing include guards for some HotSpot headers

[Qizheng Xing]

Some HotSpot header files are missing include guards, which may cause compilation errors if these files are included multiple times. This patch adds include guards for them.

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Commit messages:
 - Fix trailing whirespace
 - Add missing include guards

Changes: https://git.openjdk.org/jdk/pull/25968/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=25968&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8360474
  Stats: 21 lines in 4 files changed: 19 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/25968.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25968/head:pull/25968

PR: https://git.openjdk.org/jdk/pull/25968