RFR: 8254855: Clean up and remove unused code in vmIntrinsics

[David Holmes]

On Thu, 15 Oct 2020 22:58:58 GMT, Kim Barrett <kbarrett at openjdk.org> wrote:

>> - Remove unused code and constants
>> - Guard some code only used for assertions by ASSERT
>> - Adjust log2_FLAG_LIMIT (could have been 3 also before removing F_RNY)
>> 
>> Testing: tier1-3
>
> Looks good.

I don't agree with removing F_RNY just because we don't currently have intrinisics that match that shape! If someone
were to add one then they would now have to repair the infrastructure code needed to support that.

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PR: https://git.openjdk.java.net/jdk/pull/688