[llvm] [CodeGenPrepare][RISCV] Combine (X ^ Y) and (X == Y) where appropriate (PR #130922)

[Craig Topper via llvm-commits]

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@@ -17194,12 +17194,56 @@ static bool combine_CC(SDValue &LHS, SDValue &RHS, SDValue &CC, const SDLoc &DL,
     return true;
   }
 
+  // If XOR is reused and has an immediate that will fit in XORI,
+  // do not fold.
+  auto IsXorImmediate = [](const SDValue &Op) -> bool {
+    if (const auto XorCnst = dyn_cast<ConstantSDNode>(Op))
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topperc wrote:

`const auto *XorCnst`. LLVM Coding Standards don't want `auto` to hide that something is a pointer.

https://github.com/llvm/llvm-project/pull/130922