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

[Ulrich Weigand via cfe-commits]

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@@ -119,6 +119,12 @@ class LLVM_LIBRARY_VISIBILITY SystemZTargetInfo : public 
TargetInfo {
                              TargetInfo::ConstraintInfo &info) const override;
 
   std::string convertConstraint(const char *&Constraint) const override {
+    if (llvm::StringRef(Constraint) == "@cc") {
+      auto Len = llvm::StringRef("@cc").size();
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uweigand wrote:

This is a compile-time constant.  Again, in SystemZ.cpp that is hard-coded; why 
do we need this expression here?

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