Add noreturn for exit.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@77237 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Sema/SemaDecl.cpp b/lib/Sema/SemaDecl.cpp
index 0f4e9a4..bf2d3cc 100644
--- a/lib/Sema/SemaDecl.cpp
+++ b/lib/Sema/SemaDecl.cpp
@@ -3676,6 +3676,9 @@
       if (!FD->getAttr<ConstAttr>())
         FD->addAttr(::new (Context) ConstAttr());
     }
+
+    if (Context.BuiltinInfo.isNoReturn(BuiltinID))
+      FD->addAttr(::new (Context) NoReturnAttr());
   }
 
   IdentifierInfo *Name = FD->getIdentifier();