RFR: 8330155: Serial: Remove TenuredSpace

[Guoxiong Li]

Hi all,

This patch removes the class `TenuredSpace` and adjusts its usages. After removing `TenuredSpace`, the file `space.inline.hpp` is empty, so I remove this file and change the included header file to `space.hpp`.

The test `make test-tier1_gc` passed locally. Thanks for taking the time to review.

Best Regards,
-- Guoxiong

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Commit messages:
 - JDK-8330155

Changes: https://git.openjdk.org/jdk/pull/18894/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=18894&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8330155
  Stats: 162 lines in 21 files changed: 10 ins; 127 del; 25 mod
  Patch: https://git.openjdk.org/jdk/pull/18894.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18894/head:pull/18894

PR: https://git.openjdk.org/jdk/pull/18894