[llvm] [CodeGen] Add listener support to the rematerializer (NFC) (PR #184338)

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

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``````````diff
diff --git a/llvm/lib/CodeGen/Rematerializer.cpp b/llvm/lib/CodeGen/Rematerializer.cpp
index 80633d35c..739c59d53 100644
--- a/llvm/lib/CodeGen/Rematerializer.cpp
+++ b/llvm/lib/CodeGen/Rematerializer.cpp
@@ -405,7 +405,7 @@ void Rematerializer::deleteReg(RegisterIdx RegIdx) {
 
   Reg &DeleteReg = Regs[RegIdx];
   assert(DeleteReg.DefMI && "register was already deleted");
-  
+
   // It is not possible for the deleted instruction to be the upper region
   // boundary since we don't ever consider them rematerializable.
   MachineBasicBlock::iterator &RegionBegin = Regions[DeleteReg.DefRegion].first;

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https://github.com/llvm/llvm-project/pull/184338