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/AST/Stmt.cpp b/AST/Stmt.cpp
index 9a4d434..6663d6f 100644
--- a/AST/Stmt.cpp
+++ b/AST/Stmt.cpp
@@ -112,6 +112,7 @@
 }
 
 AsmStmt::AsmStmt(SourceLocation asmloc, 
+                 bool isvolatile,
                  unsigned numoutputs,
                  unsigned numinputs,
                  std::string *names,
@@ -122,7 +123,7 @@
                  StringLiteral **clobbers,                 
                  SourceLocation rparenloc)
   : Stmt(AsmStmtClass), AsmLoc(asmloc), RParenLoc(rparenloc), AsmStr(asmstr)
-  , NumOutputs(numoutputs), NumInputs(numinputs)
+  , IsVolatile(isvolatile), NumOutputs(numoutputs), NumInputs(numinputs)
 {
   for (unsigned i = 0, e = numinputs + numoutputs; i != e; i++) {
     Names.push_back(names[i]);
diff --git a/AST/StmtPrinter.cpp b/AST/StmtPrinter.cpp
index cc6ffda..c68257e 100644
--- a/AST/StmtPrinter.cpp
+++ b/AST/StmtPrinter.cpp
@@ -326,7 +326,12 @@
 
 
 void StmtPrinter::VisitAsmStmt(AsmStmt *Node) {
-  Indent() << "asm (";
+  Indent() << "asm ";
+  
+  if (Node->isVolatile())
+    OS << "volatile ";
+  
+  OS << "(";
   VisitStringLiteral(Node->getAsmString());
   
   // Outputs
diff --git a/AST/StmtSerialization.cpp b/AST/StmtSerialization.cpp
index 46f8559..3134f88 100644
--- a/AST/StmtSerialization.cpp
+++ b/AST/StmtSerialization.cpp
@@ -201,6 +201,7 @@
   getAsmString()->EmitImpl(S);
   S.Emit(RParenLoc);  
 
+  S.EmitBool(IsVolatile);
   S.EmitInt(NumOutputs);
   S.EmitInt(NumInputs);
 
@@ -225,7 +226,8 @@
   StringLiteral *AsmStr = StringLiteral::CreateImpl(D);
   SourceLocation PLoc = SourceLocation::ReadVal(D);
   
-  AsmStmt *Stmt = new AsmStmt(ALoc, 0, 0, 0, 0, 0,  
+  bool IsVolatile = D.ReadBool();
+  AsmStmt *Stmt = new AsmStmt(ALoc, IsVolatile, 0, 0, 0, 0, 0,  
                               AsmStr, 
                               0, 0, PLoc);