[llvm] [KnownBits] Make `avg{Ceil,Floor}S` and `{s,u}{add,sub}_sat` optimal (PR #110329)

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git-clang-format --diff 22c8b1d853dfde925eb63c4907332c596048c631 d21b441bfaf1f8f69ad9572d05c34e1f13430a27 --extensions cpp -- llvm/lib/Support/KnownBits.cpp llvm/unittests/Support/KnownBitsTest.cpp
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View the diff from clang-format here.
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``````````diff
diff --git a/llvm/lib/Support/KnownBits.cpp b/llvm/lib/Support/KnownBits.cpp
index 89e4b108b8..0380c8fcca 100644
--- a/llvm/lib/Support/KnownBits.cpp
+++ b/llvm/lib/Support/KnownBits.cpp
@@ -803,12 +803,12 @@ static KnownBits avgCompute(KnownBits LHS, KnownBits RHS, bool IsCeil,
                            /*CarryOne*/ IsCeil);
     // Assuming no overflow (which is the case since we extend the addition when
     // taking the average):
-	// Neg + Neg -> Neg
-	// Neg + Pos -> Neg if the signbit doesn't overflow
+    // Neg + Neg -> Neg
+    // Neg + Pos -> Neg if the signbit doesn't overflow
     if (LHS.isNegative() && ResOf.isNonNegative())
       Res.makeNegative();
-	// Pos + Pos -> Pos
-	// Pos + Neg -> Pos if the signbit does overflow
+    // Pos + Pos -> Pos
+    // Pos + Neg -> Pos if the signbit does overflow
     else if (LHS.isNonNegative() && ResOf.isNegative())
       Res.makeNonNegative();
   }

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https://github.com/llvm/llvm-project/pull/110329