The SSE _mm_invsqrt_ps intrinsic is missing

[gnzlbg]

See: https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_mm_invsqrt_ps&expand=4513,3028

@alexcrichton is it possible to generate a list of the missing intrinsics from stdsimd-verify ? I wonder if we haven't missed other intrinsics.

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EDIT: _mm_invsqrt_pd appears to be missing as well.

[alexcrichton]

Some of the missing ones are ones that gcc/clang don't implement becuase there's like some support library that Intel's compiler only supports, I'm not sure if this falls in that category

[gnzlbg]

Yeah, clang doesn't implement these either, but that's a bug in clang.