[AVR] Fix a bug where asm operands are printed twice

We would unconditionally call printOperand, even if PrintAsmOperand
already printed the immediate.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@294121 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/AVR/AVRAsmPrinter.cpp

@@ -130,7 +130,8 @@ bool AVRAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNum,
     }
   }
 
-  printOperand(MI, OpNum, O);
+  if (Error)
+    printOperand(MI, OpNum, O);
 
   return false;
 }

test/CodeGen/AVR/no-print-operand-twice.ll

@@ -0,0 +1,8 @@
+; RUN: llc -no-integrated-as -march=avr < %s | FileCheck %s
+
+define void @test() {
+entry:
+; CHECK: /* result: 68719476738 */
+  tail call void asm sideeffect "/* result: ${0:c} */", "i,~{dirflag},~{fpsr},~{flags}"( i64 68719476738 )
+  ret void
+}