[llvm] [AMDGPU]: Add support to unpack V_PK_MOV_B32 (PR #163464)

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

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View the diff from clang-format here.
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``````````diff
diff --git a/llvm/lib/Target/AMDGPU/SIPreEmitPeephole.cpp b/llvm/lib/Target/AMDGPU/SIPreEmitPeephole.cpp
index 8730aa29a..7ae2225da 100644
--- a/llvm/lib/Target/AMDGPU/SIPreEmitPeephole.cpp
+++ b/llvm/lib/Target/AMDGPU/SIPreEmitPeephole.cpp
@@ -615,8 +615,7 @@ void SIPreEmitPeephole::collectUnpackingCandidates(
   for (auto I = std::next(BeginMI.getIterator()); I != E; ++I) {
     MachineInstr &Instr = *I;
     uint16_t UnpackedOpCode = mapToUnpackedOpcode(Instr);
-    bool IsUnpackable =
-        UnpackedOpCode != std::numeric_limits<uint16_t>::max();
+    bool IsUnpackable = UnpackedOpCode != std::numeric_limits<uint16_t>::max();
     if (Instr.isMetaInstruction())
       continue;
     if ((Instr.isTerminator()) ||

``````````

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https://github.com/llvm/llvm-project/pull/163464