[llvm] [SPIR-V] Add pass to merge convergence region exit targets (PR #92531)

[Michal Paszkowski via llvm-commits]

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https://github.com/michalpaszkowski approved this pull request.

@Keenuts Thank you for the patch and detailed explanation! LGTM! 
A high level note for either this/future patch: It may be worth to update the [SPIRVUsage document](https://llvm.org/docs/SPIRVUsage.html) with how target intrinsics are affected in the Vulkan environment. We can discuss if there is any sensible way to split this document to discuss differences between SPIR-V "flavors".

https://github.com/llvm/llvm-project/pull/92531