RFR: 8283091: Support type conversion between different data sizes in SLP [v8]

[Fei Gao]

On Thu, 9 Jun 2022 18:01:05 GMT, Vladimir Kozlov <kvn at openjdk.org> wrote:

> Please consider adding IR framework test to make sure expected vector nodes are generated.

Added an IR framework testcase and updated to the latest JDK. 

Thanks for your review @vnkozlov .

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PR: https://git.openjdk.org/jdk/pull/7806