6aef8dfe44
The `128-bit-atomics` libcxx feature is incorrectly named because tests that are Xfailed with it is really using `int[128]`. Additionally, because toolchain support for that feature is determined based on a much smaller size (`char[16]`), tests would execute incorrectly without required toolchain support. So, rename `128-bit-atomics` as `1024-bit-atomics`, and use an appropriate type to check for the presence of the feature.
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