[libcxx-commits] [libcxx] [libc++] <experimental/simd> Add operator value_type() of simd reference (PR #68960)

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joy2myself wrote:

@philnik777 Hi! I find the test of `operator value_type() ` has dependencies to subscript operators of `simd/simd_mask`. So I add the implementation of subscript operators. You may need to review it again. Thanks!

https://github.com/llvm/llvm-project/pull/68960