[X86][Clang] VectorExprEvaluator::VisitCallExpr / InterpretBuiltin - allow element extraction/insertion intrinsics to be used in constexpr

[RKSimon]

The underlying builtins for element extraction/insertion need to be updated to work with constexpr and suitable test coverage needs adding:

__builtin_ia32_vec_ext_v4hi
__builtin_ia32_vec_ext_v16qi
__builtin_ia32_vec_ext_v8hi
__builtin_ia32_vec_ext_v4si
__builtin_ia32_vec_ext_v4sf
__builtin_ia32_vec_ext_v2di
__builtin_ia32_vec_ext_v32qi
__builtin_ia32_vec_ext_v16hi
__builtin_ia32_vec_ext_v8si
__builtin_ia32_vec_ext_v4di

__builtin_ia32_vec_set_v4hi
__builtin_ia32_vec_set_v16qi
__builtin_ia32_vec_set_v8hi
__builtin_ia32_vec_set_v4si
__builtin_ia32_vec_set_v2di
__builtin_ia32_vec_set_v32qi
__builtin_ia32_vec_set_v16hi
__builtin_ia32_vec_set_v8si
__builtin_ia32_vec_set_v4di

These wrap the MMX/SSE/AVX _mm_extract_*, _mm256_extract_*, _mm_insert_* and _mm512_insert_* intrinsics with define

[llvmbot]

@llvm/issue-subscribers-backend-x86

Author: Simon Pilgrim (RKSimon)

The underlying builtins for element extraction/insertion need to be updated to work with constexpr and suitable test coverage needs adding: ``` __builtin_ia32_vec_ext_v4hi __builtin_ia32_vec_ext_v16qi __builtin_ia32_vec_ext_v8hi __builtin_ia32_vec_ext_v4si __builtin_ia32_vec_ext_v4sf __builtin_ia32_vec_ext_v2di __builtin_ia32_vec_ext_v32qi __builtin_ia32_vec_ext_v16hi __builtin_ia32_vec_ext_v8si __builtin_ia32_vec_ext_v4di

__builtin_ia32_vec_set_v4hi
__builtin_ia32_vec_set_v16qi
__builtin_ia32_vec_set_v8hi
__builtin_ia32_vec_set_v4si
__builtin_ia32_vec_set_v2di
__builtin_ia32_vec_set_v32qi
__builtin_ia32_vec_set_v16hi
__builtin_ia32_vec_set_v8si
__builtin_ia32_vec_set_v4di

These wrap the MMX/SSE/AVX _mm_extract_* and _mm_insert_* intrinsics
</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-clang-frontend

Author: Simon Pilgrim (RKSimon)

The underlying builtins for element extraction/insertion need to be updated to work with constexpr and suitable test coverage needs adding: ``` __builtin_ia32_vec_ext_v4hi __builtin_ia32_vec_ext_v16qi __builtin_ia32_vec_ext_v8hi __builtin_ia32_vec_ext_v4si __builtin_ia32_vec_ext_v4sf __builtin_ia32_vec_ext_v2di __builtin_ia32_vec_ext_v32qi __builtin_ia32_vec_ext_v16hi __builtin_ia32_vec_ext_v8si __builtin_ia32_vec_ext_v4di

__builtin_ia32_vec_set_v4hi
__builtin_ia32_vec_set_v16qi
__builtin_ia32_vec_set_v8hi
__builtin_ia32_vec_set_v4si
__builtin_ia32_vec_set_v2di
__builtin_ia32_vec_set_v32qi
__builtin_ia32_vec_set_v16hi
__builtin_ia32_vec_set_v8si
__builtin_ia32_vec_set_v4di

These wrap the MMX/SSE/AVX _mm_extract_* and _mm_insert_* intrinsics
</details>

[llvmbot]

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

Author: Simon Pilgrim (RKSimon)

The underlying builtins for element extraction/insertion need to be updated to work with constexpr and suitable test coverage needs adding: ``` __builtin_ia32_vec_ext_v4hi __builtin_ia32_vec_ext_v16qi __builtin_ia32_vec_ext_v8hi __builtin_ia32_vec_ext_v4si __builtin_ia32_vec_ext_v4sf __builtin_ia32_vec_ext_v2di __builtin_ia32_vec_ext_v32qi __builtin_ia32_vec_ext_v16hi __builtin_ia32_vec_ext_v8si __builtin_ia32_vec_ext_v4di

__builtin_ia32_vec_set_v4hi
__builtin_ia32_vec_set_v16qi
__builtin_ia32_vec_set_v8hi
__builtin_ia32_vec_set_v4si
__builtin_ia32_vec_set_v2di
__builtin_ia32_vec_set_v32qi
__builtin_ia32_vec_set_v16hi
__builtin_ia32_vec_set_v8si
__builtin_ia32_vec_set_v4di

These wrap the MMX/SSE/AVX _mm_extract_* and _mm_insert_* intrinsics
</details>

[AdityaC4]

@RKSimon I would like to work on this!