fix some warnings, patch by Justin Handville


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@42010 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/AST/ASTContext.cpp b/AST/ASTContext.cpp
index 87f68fe..89da7dc 100644
--- a/AST/ASTContext.cpp
+++ b/AST/ASTContext.cpp
@@ -730,6 +730,9 @@
     }
   }
   assert(0 && "getFloatingTypeOfSizeWithinDomain(): illegal domain");
+  //an invalid return value, but the assert
+  //will ensure that this code is never reached.
+  return VoidTy;
 }
 
 /// compareFloatingType - Handles 3 different combos: