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

[Ulrich Weigand via cfe-commits]

================
@@ -2563,9 +2563,15 @@ EmitAsmStores(CodeGenFunction &CGF, const AsmStmt &S,
     if ((i < ResultRegIsFlagReg.size()) && ResultRegIsFlagReg[i]) {
       // Target must guarantee the Value `Tmp` here is lowered to a boolean
       // value.
-      llvm::Constant *Two = llvm::ConstantInt::get(Tmp->getType(), 2);
+      unsigned CCUpperBound = 2;
+      if (CGF.getTarget().getTriple().getArch() == llvm::Triple::systemz) {
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uweigand wrote:

Well, SystemZ simply is different here - our "flags" value is in fact a 2-bit 
value, not a 1-bit value.  Do you have any suggestions how this distinction 
could be abstracted in a cleaner way?

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