[master] RFR: 8319185: [Lilliput] Enable and fix vectorization tests [v2]

[Roman Kennke]

> This re-instates #125 after it has been lost with the Great Reset. It's a clean cherry-pick of that other commit.
> 
> Compared to #125 this change also fixes compiler/loopopts/superword/TestAlignVector.java, which is new since then.

Roman Kennke has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains three additional commits since the last revision:

 - Fix TestAlignVector.java
 - Merge branch 'master' into fix-vector-tests
 - 8319185: [Lilliput] Enable and fix vectorization tests
   
   Reviewed-by: shade

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Changes:
  - all: https://git.openjdk.org/lilliput/pull/152/files
  - new: https://git.openjdk.org/lilliput/pull/152/files/6f2c8f35..7846f7eb

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=lilliput&pr=152&range=01
 - incr: https://webrevs.openjdk.org/?repo=lilliput&pr=152&range=00-01

  Stats: 9 lines in 2 files changed: 7 ins; 1 del; 1 mod
  Patch: https://git.openjdk.org/lilliput/pull/152.diff
  Fetch: git fetch https://git.openjdk.org/lilliput.git pull/152/head:pull/152

PR: https://git.openjdk.org/lilliput/pull/152