[clang] [llvm] [SPIR-V] Add SPIR-V structurizer (PR #107408)

[Vyacheslav Levytskyy via cfe-commits]

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VyacheslavLevytskyy wrote:

All looks good!

After this is merged I plan to have a look into:
* this PR introduces new tests which fails with "extensive checks on", but they are not related to the PR's logic -- it's an existing issue with correct place to insert SPIRV type definitions required by assign type instructions, and
* llvm/test/CodeGen/SPIRV/instructions/ret-type.ll fails due to reordering of return statements -- I see the reason, but it has no local and simple fix, so probably I should spend some time soon to improve this.

https://github.com/llvm/llvm-project/pull/107408