RFR: 8302328: [s390x] Simplify asm_assert definition [v2]

[Amit Kumar]

> This PR cleanups some assert statements and specifies branch condition at calling site itself. Remaining asm_assert methods are inlined as well.

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

 - added id to illtrap
 - address lutz comment & revert inlining
 - Revert "inline asm_assert"
 - Revert "inlined assert method"
 - Revert "added inline keyword before function implementation"

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Changes:
  - all: https://git.openjdk.org/jdk/pull/12822/files
  - new: https://git.openjdk.org/jdk/pull/12822/files/72e6d990..5580cfc6

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=12822&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=12822&range=00-01

  Stats: 132 lines in 13 files changed: 52 ins; 55 del; 25 mod
  Patch: https://git.openjdk.org/jdk/pull/12822.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/12822/head:pull/12822

PR: https://git.openjdk.org/jdk/pull/12822