RFR: 8271589: fatal error with variable shift count integer rotate operation. [v3]

[Jatin Bhateja]

> Problem seen on targets which do not support variable vector shifts, in such a case vector rotation node inferred by auto-vectorizer are not disintegrable into LeftShift/RightShift and Or operations.

Jatin Bhateja has updated the pull request incrementally with one additional commit since the last revision:

  8271589: Review comment resolution.

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/4956/files
  - new: https://git.openjdk.java.net/jdk/pull/4956/files/ef3316b5..aacc06ef

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=4956&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=4956&range=01-02

  Stats: 1 line in 1 file changed: 0 ins; 1 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/4956.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/4956/head:pull/4956

PR: https://git.openjdk.java.net/jdk/pull/4956