[llvm] [SystemZ] Implement A, O and R inline assembly format flags (PR #80685)

[Ulrich Weigand via llvm-commits]

================
@@ -889,13 +889,17 @@ static void printFormattedRegName(const MCAsmInfo *MAI, unsigned RegNo,
     OS << '%' << RegName;
 }
 
+static void printReg(unsigned Reg, const MCAsmInfo *MAI, raw_ostream &OS) {
+  if (!Reg)
+    OS << '0';
+  else
+    printFormattedRegName(MAI, Reg, OS);
+}
+
 static void printOperand(const MCOperand &MCOp, const MCAsmInfo *MAI,
                          raw_ostream &OS) {
   if (MCOp.isReg()) {
-    if (!MCOp.getReg())
-      OS << '0';
-    else
-      printFormattedRegName(MAI, MCOp.getReg(), OS);
+    printReg(MCOp.getReg(), MAI, OS);
   } else if (MCOp.isImm())
----------------
uweigand wrote:

Cosmetic nit: please remove the braces as well then.

https://github.com/llvm/llvm-project/pull/80685