Add builtin knowledge about longjmp being noreturn.  Add printing for
the noreturn attribute.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@77253 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/AST/DeclPrinter.cpp b/lib/AST/DeclPrinter.cpp
index 589cdec..e5bf59f 100644
--- a/lib/AST/DeclPrinter.cpp
+++ b/lib/AST/DeclPrinter.cpp
@@ -335,6 +335,8 @@
     }
 
     Proto += ")";
+    if (D->hasAttr<NoReturnAttr>())
+      Proto += " __attribute((noreturn))";
     if (CXXConstructorDecl *CDecl = dyn_cast<CXXConstructorDecl>(D)) {
       if (CDecl->getNumBaseOrMemberInitializers() > 0) {
         Proto += " : ";