[llvm] [AMDGPU] Add an optional DSE pass during CodeGenPrepare (PR #172069)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp -- llvm/lib/Target/AMDGPU/AMDGPUTargetMachine.cpp --diff_from_common_commit
``````````

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``````````diff
diff --git a/llvm/lib/Target/AMDGPU/AMDGPUTargetMachine.cpp b/llvm/lib/Target/AMDGPU/AMDGPUTargetMachine.cpp
index e50d80914..cc1c16494 100644
--- a/llvm/lib/Target/AMDGPU/AMDGPUTargetMachine.cpp
+++ b/llvm/lib/Target/AMDGPU/AMDGPUTargetMachine.cpp
@@ -357,11 +357,10 @@ static cl::opt<bool> EnableLoadStoreVectorizer(
   cl::Hidden);
 
 // Option to enable DSE in backend.
-static cl::opt<bool> EnableDeadStoreElimination(
-  "amdgpu-dead-store-elimination",
-  cl::desc("Enable dead store elimination"),
-  cl::init(false),
-  cl::Hidden);
+static cl::opt<bool>
+    EnableDeadStoreElimination("amdgpu-dead-store-elimination",
+                               cl::desc("Enable dead store elimination"),
+                               cl::init(false), cl::Hidden);
 
 // Option to control global loads scalarization
 static cl::opt<bool> ScalarizeGlobal(

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https://github.com/llvm/llvm-project/pull/172069