[MLIR][OpenMP] Prevent loop wrapper translation crashes (#115475) This patch updates the `convertOmpOpRegions` translation function to prevent calling it for a loop wrapper region from causing a compiler crash due to a lack of terminator operations. This problem is currently not triggered because there are no cases for which the region of a loop wrapper is passed to that function. This will have to change in order to support composite construct translation to LLVM IR.
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