[llvm] [InstCombine] Support nested GEPs in OptimizePointerDifference (PR #142958)

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git-clang-format --diff HEAD~1 HEAD --extensions cpp -- llvm/lib/Transforms/InstCombine/InstCombineAddSub.cpp
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View the diff from clang-format here.
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``````````diff
diff --git a/llvm/lib/Transforms/InstCombine/InstCombineAddSub.cpp b/llvm/lib/Transforms/InstCombine/InstCombineAddSub.cpp
index eb5537717..4b6958618 100644
--- a/llvm/lib/Transforms/InstCombine/InstCombineAddSub.cpp
+++ b/llvm/lib/Transforms/InstCombine/InstCombineAddSub.cpp
@@ -2140,7 +2140,6 @@ Value *InstCombinerImpl::OptimizePointerDifference(Value *LHS, Value *RHS,
   if (!Base.Ptr)
     return nullptr;
 
-
   // To avoid duplicating the offset arithmetic, rewrite the GEP to use the
   // computed offset.
   // TODO: We should probably do this even if there is only one GEP.

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https://github.com/llvm/llvm-project/pull/142958