[llvm] [AMDGPU] Use reverse iteration in CodeGenPrepare (PR #145484)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp -- llvm/lib/Target/AMDGPU/AMDGPUCodeGenPrepare.cpp
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``````````diff
diff --git a/llvm/lib/Target/AMDGPU/AMDGPUCodeGenPrepare.cpp b/llvm/lib/Target/AMDGPU/AMDGPUCodeGenPrepare.cpp
index dd14c8801..74ea18227 100644
--- a/llvm/lib/Target/AMDGPU/AMDGPUCodeGenPrepare.cpp
+++ b/llvm/lib/Target/AMDGPU/AMDGPUCodeGenPrepare.cpp
@@ -28,8 +28,8 @@
 #include "llvm/IR/InstVisitor.h"
 #include "llvm/IR/IntrinsicsAMDGPU.h"
 #include "llvm/IR/PatternMatch.h"
-#include "llvm/InitializePasses.h"
 #include "llvm/IR/ValueHandle.h"
+#include "llvm/InitializePasses.h"
 #include "llvm/Pass.h"
 #include "llvm/Support/KnownBits.h"
 #include "llvm/Support/KnownFPClass.h"

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https://github.com/llvm/llvm-project/pull/145484