Implement parsing support for the .comm directive.  Patch by
Kevin Enderby!

llvm-svn: 74944
diff --git a/llvm/tools/llvm-mc/AsmParser.h b/llvm/tools/llvm-mc/AsmParser.h
index 333b284..bafdfb7 100644
--- a/llvm/tools/llvm-mc/AsmParser.h
+++ b/llvm/tools/llvm-mc/AsmParser.h
@@ -109,6 +109,8 @@
   /// ParseDirectiveSymbolAttribute - Parse a directive like ".globl" which
   /// accepts a single symbol (which should be a label or an external).
   bool ParseDirectiveSymbolAttribute(MCStreamer::SymbolAttr Attr);
+
+  bool ParseDirectiveComm(); // ".comm"
   
 };