Fix printing of common symbols.

Printing the symbol size matches the behavior or both gnu nm and freebsd nm.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@241480 91177308-0d34-0410-b5e6-96231b3b80d8

test/Object/X86/nm-print-size.s

@@ -3,6 +3,7 @@
 
 // CHECK: 0000000000000000 ffffffffffffffff n a
 // CHECK: 0000000000000000 0000000000000000 N b
+// CHECK: 0000000000000004 0000000000000004 C c
 
         .section foo
 a:
@@ -10,3 +11,5 @@ a:
 
         .global b
 b:
+
+        .comm c,4,8