RFR: 8285733: [s390] Vector Instruction Emitters for element-wise access are broken

[Lutz Schmidt]

Please review this rather simple pull request. It fixes some vector instruction emitters. The bugs had gone unnoticed so far because the emitters had not been used. Therefore, the fix bears no risk.

Testing was performed with new code currently under development.

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Commit messages:
 - 8285733: [s390] Vector Instruction Emitters for element-wise access are broken

Changes: https://git.openjdk.java.net/jdk/pull/8537/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=8537&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8285733
  Stats: 20 lines in 1 file changed: 1 ins; 0 del; 19 mod
  Patch: https://git.openjdk.java.net/jdk/pull/8537.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/8537/head:pull/8537

PR: https://git.openjdk.java.net/jdk/pull/8537