[llvm] [CodeGen] Use byte offsets and ptradd in ShadowStackGCLowering (PR #178436)

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

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``````````diff
diff --git a/llvm/lib/CodeGen/ShadowStackGCLowering.cpp b/llvm/lib/CodeGen/ShadowStackGCLowering.cpp
index 38a4c2e64..07b4a7b26 100644
--- a/llvm/lib/CodeGen/ShadowStackGCLowering.cpp
+++ b/llvm/lib/CodeGen/ShadowStackGCLowering.cpp
@@ -367,13 +367,13 @@ bool ShadowStackGCLoweringImpl::runOnFunction(Function &F,
     if (RootOffset > LastEnd) {
       Value *PaddingPtr =
           AtEntry.CreatePtrAdd(StackEntry, AtEntry.getInt64(LastEnd));
-      AtEntry.CreateMemSet(PaddingPtr, AtEntry.getInt8(0),
-                           RootOffset - LastEnd, Align(1));
+      AtEntry.CreateMemSet(PaddingPtr, AtEntry.getInt8(0), RootOffset - LastEnd,
+                           Align(1));
     }
 
     // For each root, compute pointer using precomputed offset
-    Value *SlotPtr =
-        AtEntry.CreatePtrAdd(StackEntry, AtEntry.getInt64(RootOffset), "gc_root");
+    Value *SlotPtr = AtEntry.CreatePtrAdd(
+        StackEntry, AtEntry.getInt64(RootOffset), "gc_root");
 
     // And use it in lieu of the alloca.
     AllocaInst *OriginalAlloca = Roots[I].second;

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https://github.com/llvm/llvm-project/pull/178436