RFR: 8278868: Add x86 vectorization support for Long.bitCount() [v2]

[Jatin Bhateja]

On Wed, 5 Jan 2022 03:59:58 GMT, Vamsi Parasa <duke at openjdk.java.net> wrote:

>> test/hotspot/jtreg/compiler/vectorization/TestPopCountVectorLong.java line 65:
>> 
>>> 63:     }
>>> 64: 
>>> 65:     public void vectorizeBitCount() {
>> 
>> We can add check based on new IR framework here.
>
> Updated the test to use IR framework...please check...

Kindly add @requires vm.cpu.features ~= ".*avx512dq.*" in tag since test case may fail on other targets.

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PR: https://git.openjdk.java.net/jdk/pull/6857