[clang] [CIR] Upstream ShuffleOp for VectorType (PR #142288)

[Amr Hesham via cfe-commits]

AmrDeveloper wrote:

> Quoiting the docs: the result of `__builtin_shufflevector` is a vector with the same element type as `vec1` and `vec2` but that has an element count equal to the number of indices specified.

Thank you, i will put it back to the description

https://github.com/llvm/llvm-project/pull/142288