Issue 166529
Summary [Clang] VectorExprEvaluator::VisitCallExpr / InterpretBuiltin - add VPERMILPD/S imm intrinsics to be used in constexpr
Labels good first issue, backend:X86, clang:frontend, clang:headers, constexpr, clang:bytecode
Assignees
Reporter RKSimon
    Sort of a mix of the PSHUFD and SHUFPS/D intrinsics - only taking a single operand
```
__m128d _mm_permute_pd (__m128d a, int imm8)
__m128d _mm_mask_permute_pd (__m128d src, __mmask8 k, __m128d a, const int imm8)
__m128d _mm_maskz_permute_pd (__mmask8 k, __m128d a, const int imm8)
__m256d _mm256_permute_pd (__m256d a, int imm8)
__m256d _mm256_mask_permute_pd (__m256d src, __mmask8 k, __m256d a, const int imm8)
__m256d _mm256_maskz_permute_pd (__mmask8 k, __m256d a, const int imm8)
__m512d _mm512_permute_pd (__m512d a, const int imm8)
__m512d _mm512_mask_permute_pd (__m512d src, __mmask8 k, __m512d a, const int imm8)
__m512d _mm512_maskz_permute_pd (__mmask8 k, __m512d a, const int imm8)

__m128 _mm_permute_ps (__m128 a, int imm8)
__m128 _mm_mask_permute_ps (__m128 src, __mmask8 k, __m128 a, const int imm8)
__m128 _mm_maskz_permute_ps (__mmask8 k, __m128 a, const int imm8)
__m256 _mm256_permute_ps (__m256 a, int imm8)
__m256 _mm256_mask_permute_ps (__m256 src, __mmask8 k, __m256 a, const int imm8)
__m256 _mm256_maskz_permute_ps (__mmask8 k, __m256 a, const int imm8)
__m512 _mm512_permute_ps (__m512 a, const int imm8)
__m512 _mm512_mask_permute_ps (__m512 src, __mmask16 k, __m512 a, const int imm8)
__m512 _mm512_maskz_permute_ps (__mmask16 k, __m512 a, const int imm8)
```
Ideally this should wait until after #166342 so we can reuse the existing callback systems

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