[llvm] [RegAlloc] Add printer and dump for VNInfo [nfc] (PR #160758)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions h,cpp -- llvm/include/llvm/CodeGen/LiveInterval.h llvm/lib/CodeGen/LiveInterval.cpp
``````````

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View the diff from clang-format here.
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``````````diff
diff --git a/llvm/lib/CodeGen/LiveInterval.cpp b/llvm/lib/CodeGen/LiveInterval.cpp
index c233b21a3..c0fe87c1b 100644
--- a/llvm/lib/CodeGen/LiveInterval.cpp
+++ b/llvm/lib/CodeGen/LiveInterval.cpp
@@ -1046,9 +1046,7 @@ void LiveInterval::print(raw_ostream &OS) const {
 }
 
 #if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
-LLVM_DUMP_METHOD void VNInfo::dump() const {
-  dbgs() << *this << '\n';
-}
+LLVM_DUMP_METHOD void VNInfo::dump() const { dbgs() << *this << '\n'; }
 
 LLVM_DUMP_METHOD void LiveRange::dump() const {
   dbgs() << *this << '\n';

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https://github.com/llvm/llvm-project/pull/160758