llvm-project

4a773b9f - [SPIR-V] Emit OpLoopMerge for non-shader targets without SPV_INTEL_unstructured_loop_controls extension (#187519)

[SPIR-V] Emit OpLoopMerge for non-shader targets without SPV_INTEL_unstructured_loop_controls extension (#187519) `OpLoopMerge` emission was not supported due to the fact that spirv structurizer is not being run for non-shader targets. After enabling support for `SPV_INTEL_unstructured_loop_controls` in https://github.com/llvm/llvm-project/pull/178799 is started to preserve some information about unstructured control flow. This PR is intended to enable support for `OpLoopMerge` without extension. Note: changes in `llvm/test/CodeGen/SPIRV/pointers/phi-chain-types.ll` and `llvm/test/CodeGen/SPIRV/llvm-intrinsics/memset.ll` are due to the fact that loop layout has changed after `loop-simplify` pass enabling