RFR: 8281079: [s390] Unify Address Operand Encoding in Instruction Emitters

[Lutz Schmidt]

May I please request reviews for this cleanup and unification change. It streamlines the address operand emitters for all instructions. As such, the modifications are widespread and may be cumbersome to review. Please ask questions if anything is unclear.

SAP does not maintain a full s390x build and test environment any longer. I would therefore very much appreciate if somebody would run a build and test cycle on s390x. 

As this is a s390x-only change, other platforms are not impacted.

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Commit messages:
 - 8281079: [s390] Unify Address Operand Encoding in Instruction Emitters

Changes: https://git.openjdk.java.net/jdk/pull/7324/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=7324&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8281079
  Stats: 494 lines in 4 files changed: 138 ins; 70 del; 286 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7324.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7324/head:pull/7324

PR: https://git.openjdk.java.net/jdk/pull/7324