RFR: 8259610: VectorReshapeTests are not effective due to failing to intrinsify "VectorSupport.convert" [v5]

[Mai Đặng Quân Anh]

> Hi,
> 
> This patch adds several c2 tests for vector reshape operations. The tests verify the intrinsification of the corresponding operations by using the IR framework and verify the correctness of the results of compiled codes.
> 
> While working on this patch, I spot some regressions regarding compilation on AVX1.
> 
> Thank you very much.

Mai Đặng Quân Anh 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 13 additional commits since the last revision:

 - remove imports
 - refactor main methods
 - Merge branch 'master' into vectorReshapeTests
 - fix cpu pattern on Neon
 - concretify parameter types
 - reduce invocation count, improve test cases
 - Merge branch 'master' into vectorReshapeTests
 - grammar in comment
 - missing copyright
 - add comments
 - ... and 3 more: https://git.openjdk.java.net/jdk/compare/b3acd1f4...5d3b23a7

-------------

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/6724/files
  - new: https://git.openjdk.java.net/jdk/pull/6724/files/a2cee23d..5d3b23a7

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=6724&range=04
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=6724&range=03-04

  Stats: 8492 lines in 297 files changed: 4875 ins; 1782 del; 1835 mod
  Patch: https://git.openjdk.java.net/jdk/pull/6724.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/6724/head:pull/6724

PR: https://git.openjdk.java.net/jdk/pull/6724