[Clang] VectorExprEvaluator::VisitCallExpr / InterpretBuiltin - allow AVX/AVX512 subvector insertion intrinsics to be used in constexpr

[RKSimon]

_mm256_insertf128_pd
_mm256_insertf128_ps
_mm256_insertf128_si256
_mm256_inserti128_si256

_mm256_insertf32x4 _mm256_mask_insertf32x4 _mm256_maskz_insertf32x4
_mm512_insertf32x4 _mm512_mask_insertf32x4 _mm512_maskz_insertf32x4
_mm512_insertf32x8 _mm512_mask_insertf32x8 _mm512_maskz_insertf32x8
_mm256_insertf64x2 _mm256_mask_insertf64x2 _mm256_maskz_insertf64x2
_mm512_insertf64x2 _mm512_mask_insertf64x2 _mm512_maskz_insertf64x2
_mm512_insertf64x4 _mm512_mask_insertf64x4 _mm512_maskz_insertf64x4

_mm256_inserti32x4 _mm256_mask_inserti32x4 _mm256_maskz_inserti32x4
_mm512_inserti32x4 _mm512_mask_inserti32x4 _mm512_maskz_inserti32x4
_mm512_inserti32x8 _mm512_mask_inserti32x8 _mm512_maskz_inserti32x8
_mm256_inserti64x2 _mm256_mask_inserti64x2 _mm256_maskz_inserti64x2
_mm512_inserti64x2 _mm512_mask_inserti64x2 _mm512_maskz_inserti64x2
_mm512_inserti64x4 _mm512_mask_inserti64x4 _mm512_maskz_inserti64x4

[llvmbot]

@llvm/issue-subscribers-backend-x86

Author: Simon Pilgrim (RKSimon)

``` _mm256_insertf128_pd _mm256_insertf128_ps _mm256_insertf128_si256 _mm256_inserti128_si256

_mm256_insertf32x4 _mm256_mask_insertf32x4 _mm256_maskz_insertf32x4
_mm512_insertf32x4 _mm512_mask_insertf32x4 _mm512_maskz_insertf32x4
_mm512_insertf32x8 _mm512_mask_insertf32x8 _mm512_maskz_insertf32x8
_mm256_insertf64x2 _mm256_mask_insertf64x2 _mm256_maskz_insertf64x2
_mm512_insertf64x2 _mm512_mask_insertf64x2 _mm512_maskz_insertf64x2
_mm512_insertf64x4 _mm512_mask_insertf64x4 _mm512_maskz_insertf64x4

_mm256_inserti32x4 _mm256_mask_inserti32x4 _mm256_maskz_inserti32x4
_mm512_inserti32x4 _mm512_mask_inserti32x4 _mm512_maskz_inserti32x4
_mm512_inserti32x8 _mm512_mask_inserti32x8 _mm512_maskz_inserti32x8
_mm256_inserti64x2 _mm256_mask_inserti64x2 _mm256_maskz_inserti64x2
_mm512_inserti64x2 _mm512_mask_inserti64x2 _mm512_maskz_inserti64x2
_mm512_inserti64x4 _mm512_mask_inserti64x4 _mm512_maskz_inserti64x4

</details>

[llvmbot]

@llvm/issue-subscribers-clang-frontend

Author: Simon Pilgrim (RKSimon)

``` _mm256_insertf128_pd _mm256_insertf128_ps _mm256_insertf128_si256 _mm256_inserti128_si256

_mm256_insertf32x4 _mm256_mask_insertf32x4 _mm256_maskz_insertf32x4
_mm512_insertf32x4 _mm512_mask_insertf32x4 _mm512_maskz_insertf32x4
_mm512_insertf32x8 _mm512_mask_insertf32x8 _mm512_maskz_insertf32x8
_mm256_insertf64x2 _mm256_mask_insertf64x2 _mm256_maskz_insertf64x2
_mm512_insertf64x2 _mm512_mask_insertf64x2 _mm512_maskz_insertf64x2
_mm512_insertf64x4 _mm512_mask_insertf64x4 _mm512_maskz_insertf64x4

_mm256_inserti32x4 _mm256_mask_inserti32x4 _mm256_maskz_inserti32x4
_mm512_inserti32x4 _mm512_mask_inserti32x4 _mm512_maskz_inserti32x4
_mm512_inserti32x8 _mm512_mask_inserti32x8 _mm512_maskz_inserti32x8
_mm256_inserti64x2 _mm256_mask_inserti64x2 _mm256_maskz_inserti64x2
_mm512_inserti64x2 _mm512_mask_inserti64x2 _mm512_maskz_inserti64x2
_mm512_inserti64x4 _mm512_mask_inserti64x4 _mm512_maskz_inserti64x4

</details>

[llvmbot]

Hi!

This issue may be a good introductory issue for people new to working on LLVM. If you would like to work on this issue, your first steps are:

1. Check that no other contributor is working on this issue. If someone is assigned to the issue or claimed to be working on it, ping the person. After one week without a response, the assignee may be changed.
2. Leave a comment indicating that you are working on the issue, or just create a pull request after following the steps below. Mention this issue in the description of the pull request.
3. Fix the issue locally.
4. Run the test suite locally. Remember that the subdirectories under test/ create fine-grained testing targets, so you can e.g. use make check-clang-ast to only run Clang's AST tests.
5. Create a Git commit.
6. Run git clang-format HEAD~1 to format your changes.
7. Open a pull request to the upstream repository on GitHub. Detailed instructions can be found in GitHub's documentation. Mention this issue in the description of the pull request.

If you have any further questions about this issue, don't hesitate to ask via a comment in the thread below.

[llvmbot]

@llvm/issue-subscribers-good-first-issue

Author: Simon Pilgrim (RKSimon)

``` _mm256_insertf128_pd _mm256_insertf128_ps _mm256_insertf128_si256 _mm256_inserti128_si256

_mm256_insertf32x4 _mm256_mask_insertf32x4 _mm256_maskz_insertf32x4
_mm512_insertf32x4 _mm512_mask_insertf32x4 _mm512_maskz_insertf32x4
_mm512_insertf32x8 _mm512_mask_insertf32x8 _mm512_maskz_insertf32x8
_mm256_insertf64x2 _mm256_mask_insertf64x2 _mm256_maskz_insertf64x2
_mm512_insertf64x2 _mm512_mask_insertf64x2 _mm512_maskz_insertf64x2
_mm512_insertf64x4 _mm512_mask_insertf64x4 _mm512_maskz_insertf64x4

_mm256_inserti32x4 _mm256_mask_inserti32x4 _mm256_maskz_inserti32x4
_mm512_inserti32x4 _mm512_mask_inserti32x4 _mm512_maskz_inserti32x4
_mm512_inserti32x8 _mm512_mask_inserti32x8 _mm512_maskz_inserti32x8
_mm256_inserti64x2 _mm256_mask_inserti64x2 _mm256_maskz_inserti64x2
_mm512_inserti64x2 _mm512_mask_inserti64x2 _mm512_maskz_inserti64x2
_mm512_inserti64x4 _mm512_mask_inserti64x4 _mm512_maskz_inserti64x4

</details>

[AdityaC4]

Hey @RKSimon , I'd like to work on this issue.