Move helper functions out of SemaHLSL into a common location for SemaSPIRV to use

[Icohedron]

While working on #122992, @inbelic mentioned that the semantics checks in clang/lib/Sema/SemaSPIRV.cpp could be simplified by using helper functions that are currently only present in clang/lib/Sema/SemaHLSL.cpp, such as CheckArgTypeIsCorrect and CheckAllArgTypesAreCorrect.

It would be useful to migrate the helper functions out of SemaHLSL into a common location accessible to both SemaHLSL and SemaSPIRV to make the code in SemaSPIRV less verbose and more readable.

[farzonl]

Keep in mind not all hlsl vector rules apply to spirv. For example half and double data type rules in hlsl will be different from spirv.

[llvmbot]

@llvm/issue-subscribers-clang-frontend

Author: Deric Cheung (Icohedron)

While working on #122992, @inbelic [mentioned](https://github.com//pull/122992#pullrequestreview-2559625948) that the semantics checks in `clang/lib/Sema/SemaSPIRV.cpp` could be simplified by using helper functions that are currently only present in `clang/lib/Sema/SemaHLSL.cpp`, such as `CheckArgTypeIsCorrect` and `CheckAllArgTypesAreCorrect`.

It would be useful to migrate the helper functions out of SemaHLSL into a common location accessible to both SemaHLSL and SemaSPIRV to make the code in SemaSPIRV less verbose and more readable.

[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 has already been assigned to this issue. If you believe that no one is actually working on it despite an assignment, ping the person. After one week without a response, the assignee may be changed.
2. In the comments of this issue, request for it to be assigned to you, 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: Deric Cheung (Icohedron)

While working on #122992, @inbelic [mentioned](https://github.com//pull/122992#pullrequestreview-2559625948) that the semantics checks in `clang/lib/Sema/SemaSPIRV.cpp` could be simplified by using helper functions that are currently only present in `clang/lib/Sema/SemaHLSL.cpp`, such as `CheckArgTypeIsCorrect` and `CheckAllArgTypesAreCorrect`.

It would be useful to migrate the helper functions out of SemaHLSL into a common location accessible to both SemaHLSL and SemaSPIRV to make the code in SemaSPIRV less verbose and more readable.