[clang] [flang] [llvm] [mlir] [OMPIRBuilder] always leave PARALLEL via the same barrier (PR #164586)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions c,h,cpp -- clang/test/OpenMP/cancel_codegen.cpp clang/test/OpenMP/critical_codegen.cpp clang/test/OpenMP/critical_codegen_attr.cpp clang/test/OpenMP/irbuilder_nested_parallel_for.c clang/test/OpenMP/masked_codegen.cpp clang/test/OpenMP/master_codegen.cpp clang/test/OpenMP/nested_loop_codegen.cpp clang/test/OpenMP/ordered_codegen.cpp clang/test/OpenMP/parallel_codegen.cpp llvm/include/llvm/Frontend/OpenMP/OMPIRBuilder.h llvm/lib/Frontend/OpenMP/OMPIRBuilder.cpp llvm/unittests/Frontend/OpenMPIRBuilderTest.cpp mlir/lib/Target/LLVMIR/Dialect/OpenMP/OpenMPToLLVMIRTranslation.cpp --diff_from_common_commit
``````````

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``````````diff
diff --git a/llvm/lib/Frontend/OpenMP/OMPIRBuilder.cpp b/llvm/lib/Frontend/OpenMP/OMPIRBuilder.cpp
index 5ce1c751c..741fc3d15 100644
--- a/llvm/lib/Frontend/OpenMP/OMPIRBuilder.cpp
+++ b/llvm/lib/Frontend/OpenMP/OMPIRBuilder.cpp
@@ -689,9 +689,8 @@ OpenMPIRBuilder::FinalizationInfo::getFiniBB(IRBuilderBase &Builder) {
   return FiniBB;
 }
 
-Error
-OpenMPIRBuilder::FinalizationInfo::mergeFiniBB(IRBuilderBase &Builder,
-                                               BasicBlock *OtherFiniBB) {
+Error OpenMPIRBuilder::FinalizationInfo::mergeFiniBB(IRBuilderBase &Builder,
+                                                     BasicBlock *OtherFiniBB) {
   // Simple case: FiniBB does not exist yet: re-use OtherFiniBB.
   if (!FiniBB) {
     FiniBB = OtherFiniBB;

``````````

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https://github.com/llvm/llvm-project/pull/164586