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5aa741d7 - [mlir][SPIRVToLLVM] Erase empty `spirv.mlir.loop` in `LoopPattern` (#113527)

[mlir][SPIRVToLLVM] Erase empty `spirv.mlir.loop` in `LoopPattern` (#113527) This PR erases `spirv.mlir.loop` with an empty region in `LoopPattern`, resolving a crash. Fixes #113404.