[libcxx-commits] [libcxx] [libcxx] Update 128-bit-atomics feature test (PR #83841)

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amilendra wrote:

> Thanks for noticing this! We used to call it `large-atomics` and we moved to specific sizes instead because that's what we needed to convey in the test suite.
> 
> Instead, I would simply rename it to `has-1024-bit-atomics` and use `char[1024/8]` in the test. WDYT?

Makes sense. Done.

https://github.com/llvm/llvm-project/pull/83841