[mlir][spirv] Support conversion from `vector.from_elements`

[kuhar]

This op was added fairly recently: #95938. We should support it in vector-to-spirv.

The lowering should be to spirv.CompositeConstruct + a special case for scalars.

[llvmbot]

@llvm/issue-subscribers-mlir-spirv

Author: Jakub Kuderski (kuhar)

This op was added fairly recently: https://github.com//pull/95938. We should support it in vector-to-spirv.

The lowering should be to spirv.CompositeConstruct + a special case for scalars.

[llvmbot]

@llvm/issue-subscribers-mlir

Author: Jakub Kuderski (kuhar)

This op was added fairly recently: https://github.com//pull/95938. We should support it in vector-to-spirv.

The lowering should be to spirv.CompositeConstruct + a special case for scalars.