RFR: 8279651: [vectorapi] Implement the missing intrinsics for casting from integrals on x64 [v8]

[Vladimir Kozlov]

On Fri, 14 Jan 2022 04:08:03 GMT, Quan Anh Mai <duke at openjdk.java.net> wrote:

>> Hi,
>> 
>> This patch implements the remaining casts from integral types on x64.
>> 
>> Thank you very much.
>
> Quan Anh Mai has updated the pull request incrementally with one additional commit since the last revision:
> 
>   fix

I submitted new testing.  You need second review.

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PR: https://git.openjdk.java.net/jdk/pull/7002