[llvm] [BasicAA] Refactor offset-based heuristics in `aliasGEP`, unify style (NFC) (PR #218687)

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

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``````````diff
diff --git a/llvm/lib/Analysis/BasicAliasAnalysis.cpp b/llvm/lib/Analysis/BasicAliasAnalysis.cpp
index a7bbe55a2..ff8916036 100644
--- a/llvm/lib/Analysis/BasicAliasAnalysis.cpp
+++ b/llvm/lib/Analysis/BasicAliasAnalysis.cpp
@@ -591,7 +591,6 @@ struct BasicAAResult::VariableGEPOffsetInfo {
   ConstantRange OffsetRange;
 };
 
-
 /// If V is a symbolic pointer expression, decompose it into a base pointer
 /// with a constant offset and a number of scaled symbolic offsets.
 ///

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https://github.com/llvm/llvm-project/pull/218687