RFR: 8204541: Correctly support AIX xlC 16.1 symbol visibility flags [v2]

[Ichiroh Takiguchi]

On Fri, 18 Mar 2022 08:07:53 GMT, Thomas Stuefe <stuefe at openjdk.org> wrote:

>> Ichiroh Takiguchi has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Remove unexpected comment
>
> So, does this mean we cannot build with older xlC versions anymore? Just curious.
> 
> Pinging @backwaterred .

Thanks, @tstuefe .

I saw following link, I 'm using AIX XL C++ 16.1.
https://wiki.openjdk.java.net/display/Build/Supported+Build+Platforms

And following change was already applied. 
[JDK-8224214](https://bugs.openjdk.java.net/browse/JDK-8224214) [AIX] Remove support for legacy xlc compiler

@backwaterred , could you check older compiler should be supported ?

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PR: https://git.openjdk.java.net/jdk/pull/7862