[llvm] [RegAlloc] Consider rematerialization over CSR use (PR #206756)

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

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``````````diff
diff --git a/llvm/lib/CodeGen/RegAllocGreedy.cpp b/llvm/lib/CodeGen/RegAllocGreedy.cpp
index b6e607884..1cb27db4b 100644
--- a/llvm/lib/CodeGen/RegAllocGreedy.cpp
+++ b/llvm/lib/CodeGen/RegAllocGreedy.cpp
@@ -2424,8 +2424,7 @@ BlockFrequency RAGreedy::calcRematCost(const LiveInterval &VirtReg,
     if (!HasNoFirstCSRReg)
       return BlockFrequency::max();
 
-    RematCost +=
-        SpillPlacer->getBlockFrequency(UseMI.getParent()->getNumber());
+    RematCost += SpillPlacer->getBlockFrequency(UseMI.getParent()->getNumber());
     HasUse = true;
   }
 

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https://github.com/llvm/llvm-project/pull/206756