RFR: 8257625: C2: Harden input checks in vector intrinsics

[Vladimir Ivanov]

On Thu, 3 Dec 2020 00:38:45 GMT, Vladimir Kozlov <kvn at openjdk.org> wrote:

>> I don't think it's needed. That's effectively dead code and the message won't provide any actionable information.
>
> I actually asked it not for this dead code but for *following* check for constants. I could not select it because stupid GH  UI.  You print message in previous intrinsic in such case.

Yes, good catch. Unfortunately, I overlooked your comment before integration. Will follow up with a fix separately.

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PR: https://git.openjdk.java.net/jdk/pull/1575