[llvm] [SPIR-V] Add SPIR-V structurizer (PR #97606)

[Nathan Gauër via llvm-commits]

Keenuts wrote:

> Thank you @Keenuts for the patch! I added some small nitpicky comments, but I think the patch looks great and is really easy to follow!

Thanks for the review! Fixed the style issues and rebased on main.

https://github.com/llvm/llvm-project/pull/97606