RFR: 8259610: VectorReshapeTests are not effective due to failing to intrinsify "VectorSupport.convert" [v7]

[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 incrementally with one additional commit since the last revision:

  typos

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/6724/files
  - new: https://git.openjdk.java.net/jdk/pull/6724/files/2af640c1..7acd2fa4

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=6724&range=06
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=6724&range=05-06

  Stats: 2 lines in 2 files changed: 0 ins; 0 del; 2 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