Add support for builtin astype:
__builtin_astype(): Used to reinterpreted as another data type of the same size using for both scalar and vector data types.
Added test case.

llvm-svn: 132612
diff --git a/clang/lib/AST/ItaniumMangle.cpp b/clang/lib/AST/ItaniumMangle.cpp
index aad6e9c..53c2045 100644
--- a/clang/lib/AST/ItaniumMangle.cpp
+++ b/clang/lib/AST/ItaniumMangle.cpp
@@ -2093,7 +2093,9 @@
   case Expr::VAArgExprClass:
   case Expr::CXXUuidofExprClass:
   case Expr::CXXNoexceptExprClass:
-  case Expr::CUDAKernelCallExprClass: {
+  case Expr::CUDAKernelCallExprClass:
+  case Expr::AsTypeExprClass:
+  {
     // As bad as this diagnostic is, it's better than crashing.
     Diagnostic &Diags = Context.getDiags();
     unsigned DiagID = Diags.getCustomDiagID(Diagnostic::Error,