[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") {
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uweigand wrote:

This should read the same as the check in SystemZ.cpp above.  Why do we have 
`llvm::StringRef(Constraint) == "@cc"` here and 
`!StringRef("@cc").compare(Name)` above?  Decide which form is preferable and 
use that consistently.

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