RFR: 8364128: Improve gathering of cpu feature names using stringStream [v5]

[Ashay Rane]

On Wed, 6 Aug 2025 14:02:21 GMT, Ashutosh Mehra <asmehra at openjdk.org> wrote:

>> Ashutosh Mehra has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Address review comments
>>   
>>   Signed-off-by: Ashutosh Mehra <asmehra at redhat.com>
>
> Can I get one more review of this please.

@ashu-mehra  Unfortunately, this change breaks the Windows/ARM64 code, since this patch doesn't apply the same changes to `_features` in [vm_version_windows_aarch64.cpp](https://github.com/ashu-mehra/jdk/blob/cca14916b3d3be578612e468a4bae573f98c39d0/src/hotspot/os_cpu/windows_aarch64/vm_version_windows_aarch64.cpp#L29-L45).  Can you fix this please?  Thanks!

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PR Comment: https://git.openjdk.org/jdk/pull/26515#issuecomment-3974232238