[clang] [CIR][OpenMP] Implement lowering for the 'num_threads' clause for 'parallel' directive (PR #202466)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp,c -- clang/lib/CIR/CodeGen/CIRGenOpenMPClause.cpp clang/lib/CIR/Lowering/DirectToLLVM/LowerToLLVM.cpp clang/test/CIR/CodeGenOpenMP/parallel.c --diff_from_common_commit
``````````

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View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/CIR/CodeGen/CIRGenOpenMPClause.cpp b/clang/lib/CIR/CodeGen/CIRGenOpenMPClause.cpp
index 736cc8e1b..216bb8671 100644
--- a/clang/lib/CIR/CodeGen/CIRGenOpenMPClause.cpp
+++ b/clang/lib/CIR/CodeGen/CIRGenOpenMPClause.cpp
@@ -70,24 +70,23 @@ public:
     if constexpr (std::is_same_v<OpTy, mlir::omp::ParallelOp>) {
       Expr *numThreadsExpr = clause->getNumThreads();
       mlir::Value numThreadsValue = cgf.emitScalarExpr(numThreadsExpr);
-      mlir::Location numThreadsLoc = cgf.cgm.getLoc(numThreadsExpr->getBeginLoc());
+      mlir::Location numThreadsLoc =
+          cgf.cgm.getLoc(numThreadsExpr->getBeginLoc());
 
-      cir::IntType cirIntType = mlir::cast<cir::IntType>(numThreadsValue.getType());
+      cir::IntType cirIntType =
+          mlir::cast<cir::IntType>(numThreadsValue.getType());
       mlir::Type stdIntType = builder.getIntegerType(cirIntType.getWidth());
 
-      mlir::Value unrealizedCastNumThreads = mlir::UnrealizedConversionCastOp::create(
-        builder,
-        numThreadsLoc,
-        stdIntType,
-        numThreadsValue
-      ).getResult(0);
+      mlir::Value unrealizedCastNumThreads =
+          mlir::UnrealizedConversionCastOp::create(builder, numThreadsLoc,
+                                                   stdIntType, numThreadsValue)
+              .getResult(0);
 
       operation.getNumThreadsVarsMutable().append(unrealizedCastNumThreads);
     } else {
       cgf.cgm.errorNYI(
-        clause->getBeginLoc(),
-        "OMPNumThreadsClause unimplemented on this directive kind"
-      );
+          clause->getBeginLoc(),
+          "OMPNumThreadsClause unimplemented on this directive kind");
     }
   }
 

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https://github.com/llvm/llvm-project/pull/202466