Avoid creating expensive comment string if it's not going to be printed.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53369 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/DwarfWriter.cpp b/lib/CodeGen/DwarfWriter.cpp
index 8ce689f..a5862c9 100644
--- a/lib/CodeGen/DwarfWriter.cpp
+++ b/lib/CodeGen/DwarfWriter.cpp
@@ -1091,7 +1091,10 @@
           Asm->EOL("Offset");
         } else if (Reg < 64) {
           Asm->EmitInt8(DW_CFA_offset + Reg);
-          Asm->EOL("DW_CFA_offset + Reg (" + utostr(Reg) + ")");
+          if (VerboseAsm)
+            Asm->EOL("DW_CFA_offset + Reg (" + utostr(Reg) + ")");
+          else
+            Asm->EOL();
           Asm->EmitULEB128Bytes(Offset);
           Asm->EOL("Offset");
         } else {