allow @ in symbol names without quoting the identifier.  This 
allows things like @PLT without quotes.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@81296 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/MC/MCSymbol.cpp b/lib/MC/MCSymbol.cpp
index 68ab24d..ef58aec 100644
--- a/lib/MC/MCSymbol.cpp
+++ b/lib/MC/MCSymbol.cpp
@@ -39,7 +39,7 @@
     if ((C < 'a' || C > 'z') &&
         (C < 'A' || C > 'Z') &&
         (C < '0' || C > '9') &&
-        C != '_' && C != '$' && C != '.')
+        C != '_' && C != '$' && C != '.' && C != '@')
       return true;
   }
   return false;