[clang] [CIR][HIP] Add Stub body emission test coverage and Fix kernelHandle storage (PR #179823)

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<!--LLVM CODE FORMAT COMMENT: {clang-format}-->


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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp -- clang/lib/CIR/CodeGen/CIRGenCUDANV.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 3b1087c8f..32b785c7a 100644
--- a/clang/lib/CIR/CodeGen/CIRGenCUDANV.cpp
+++ b/clang/lib/CIR/CodeGen/CIRGenCUDANV.cpp
@@ -204,9 +204,8 @@ void CIRGenNVCUDARuntime::emitDeviceStubBodyNew(CIRGenFunction &cgf,
 
   // We now either pick the function or the stub global for cuda, hip
   // respectively.
-  mlir::Value* a;
-  
-  
+  mlir::Value *a;
+
   mlir::Value kernel = [&]() -> mlir::Value {
     if (cir::GlobalOp globalOp = llvm::dyn_cast_or_null<cir::GlobalOp>(
             kernelHandles[fn.getSymName()])) {

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https://github.com/llvm/llvm-project/pull/179823