[llvm] [RISCV] Use DenseMap to track V0 definition. NFC (PR #84465)

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git-clang-format --diff 4cfd4a7896b5fd50274ec8573c259d7ad41741de cf7bc7aa311c1dcbd820a69b4c2ada768bb708b5 -- llvm/lib/Target/RISCV/RISCVFoldMasks.cpp
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View the diff from clang-format here.
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diff --git a/llvm/lib/Target/RISCV/RISCVFoldMasks.cpp b/llvm/lib/Target/RISCV/RISCVFoldMasks.cpp
index e0b0f28291..2089f5dda6 100644
--- a/llvm/lib/Target/RISCV/RISCVFoldMasks.cpp
+++ b/llvm/lib/Target/RISCV/RISCVFoldMasks.cpp
@@ -204,7 +204,7 @@ bool RISCVFoldMasks::runOnMachineFunction(MachineFunction &MF) {
     const MachineInstr *CurrentV0Def = nullptr;
     for (const MachineInstr &MI : MBB) {
       if (MI.readsRegister(RISCV::V0, TRI))
-	V0Defs[&MI] = CurrentV0Def;
+        V0Defs[&MI] = CurrentV0Def;
 
       if (MI.definesRegister(RISCV::V0, TRI))
         CurrentV0Def = &MI;

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https://github.com/llvm/llvm-project/pull/84465