RFR: 8289801: [IR Framework] Add flags to whitelist which can be used to simulate a specific machine setup like UseAVX

[Jie Fu]

On Sat, 16 Jul 2022 14:37:04 GMT, Vladimir Kozlov <kvn at openjdk.org> wrote:

> compiler/c2/irTests/TestVectorizeURShiftSubword.java test failed. Details in RFE.

Thanks @vnkozlov for the review and testing.

I can only reproduce the failure with `UseSSE < 4`, but passed with UseAVX=0 on x86.
The reason is that `RShiftVB` isn't supported with `UseSSE < 4` on x86.
The fix just skips the test when `UseSSE < 4` on x86.
Thanks.

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PR: https://git.openjdk.org/jdk/pull/9509