RFR: 8303147: [s390x] fast & slow debug builds are broken [v3]

[Amit Kumar]

> This PR fixes broken fast debug and slow debug build for s390x-arch. tier1 test are completed and results are not affect after this patch.

Amit Kumar has updated the pull request incrementally with three additional commits since the last revision:

 - updates assert condition
 - Revert "build fix for s390x"
   
   This reverts commit bb0ae5d8340b8fd99c4c8d7ab5623739e4d2fa7a.
 - Revert "use constant instead of enum"
   
   This reverts commit 820e288422e86e14323872dbe21550915e28c7e9.

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Changes:
  - all: https://git.openjdk.org/jdk/pull/12825/files
  - new: https://git.openjdk.org/jdk/pull/12825/files/820e2884..4e2c8112

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=12825&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=12825&range=01-02

  Stats: 47 lines in 14 files changed: 15 ins; 22 del; 10 mod
  Patch: https://git.openjdk.org/jdk/pull/12825.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/12825/head:pull/12825

PR: https://git.openjdk.org/jdk/pull/12825