RFR: 8297941: Add override modifier in space.hpp [v2]

[Albert Mingkun Yang]

> Simple patch generated using `clang-tidy`.

Albert Mingkun Yang has updated the pull request incrementally with one additional commit since the last revision:

  review

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Changes:
  - all: https://git.openjdk.org/jdk/pull/11451/files
  - new: https://git.openjdk.org/jdk/pull/11451/files/1aafddfb..7abf5a56

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=11451&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=11451&range=00-01

  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/11451.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11451/head:pull/11451

PR: https://git.openjdk.org/jdk/pull/11451