Keep track of whether the asm is volatile or not.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@44297 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/Sema/Sema.h b/Sema/Sema.h
index f747cef..16d4cab 100644
--- a/Sema/Sema.h
+++ b/Sema/Sema.h
@@ -347,6 +347,7 @@
                                      ExprTy *RetValExp);
   
   virtual StmtResult ActOnAsmStmt(SourceLocation AsmLoc,
+                                  bool IsVolatile,
                                   unsigned NumOutputs,
                                   unsigned NumInputs,
                                   std::string *Names,