RFR: 8247732: validate user-input intrinsic_ids in ControlIntrinsic [v12]

[Xin Liu]

On Thu, 17 Dec 2020 00:32:07 GMT, Xin Liu <xliu at openjdk.org> wrote:

>> Looks good to me.
>
> I ran test-tier1 with JTREG="VM_OPTIONS=-XX:CompileThreshold=100" again. it's clear. 
> I think it's safe. May I ask a sponsor to merge it?

Thanks you, all reviewers!

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PR: https://git.openjdk.java.net/jdk/pull/1179