[clang] [llvm] Add support for flag output operand "=@cc" for SystemZ. (PR #125970)

[Ulrich Weigand via llvm-commits]

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@@ -8701,95 +8734,266 @@ SDValue SystemZTargetLowering::combineSETCC(
   return SDValue();
 }
 
-static bool combineCCMask(SDValue &CCReg, int &CCValid, int &CCMask) {
+static std::pair<SDValue, int> findCCUse(const SDValue &Val) {
+  auto *N = Val.getNode();
+  if (!N)
+    return std::make_pair(SDValue(), SystemZ::CCMASK_NONE);
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uweigand wrote:

Just wondering: can N actually ever be null here?

https://github.com/llvm/llvm-project/pull/125970