[clang] [CIR][CUDA] Register only defined stubs (PR #231390)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp -- clang/lib/CIR/CodeGen/CIRGenCUDANV.cpp clang/lib/CIR/Dialect/Transforms/LoweringPrepare.cpp --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/CIRGenCUDANV.cpp b/clang/lib/CIR/CodeGen/CIRGenCUDANV.cpp
index 1c6d04916..7be04dbda 100644
--- a/clang/lib/CIR/CodeGen/CIRGenCUDANV.cpp
+++ b/clang/lib/CIR/CodeGen/CIRGenCUDANV.cpp
@@ -524,8 +524,9 @@ void CIRGenNVCUDARuntime::handleGlobalReplace(cir::GlobalOp oldGV,
 }
 
 /// Whether this translation unit has anything for the CUDA runtime to register.
-/// Like LoweringPrepare, count only kernel stub definitions and device variables
-/// carrying registration metadata, not kernel declarations or launch-site calls.
+/// Like LoweringPrepare, count only kernel stub definitions and device
+/// variables carrying registration metadata, not kernel declarations or
+/// launch-site calls.
 static bool hasEntitiesToRegister(mlir::ModuleOp module) {
   // A walk, not a scan of the module body, so this stays in agreement with the
   // recursive walk LoweringPrepare collects them with.

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https://github.com/llvm/llvm-project/pull/231390