Pull CodeGenFunction::GetUndefRValue() out of EmitUnsupportedRValue.

llvm-svn: 63845
diff --git a/clang/lib/CodeGen/CodeGenFunction.h b/clang/lib/CodeGen/CodeGenFunction.h
index ab145d7..bf27d0a 100644
--- a/clang/lib/CodeGen/CodeGenFunction.h
+++ b/clang/lib/CodeGen/CodeGenFunction.h
@@ -450,6 +450,9 @@
   //                         LValue Expression Emission
   //===--------------------------------------------------------------------===//
 
+  /// GetUndefRValue - Get an appropriate 'undef' rvalue for the given type.
+  RValue GetUndefRValue(QualType Ty);
+
   /// EmitUnsupportedRValue - Emit a dummy r-value using the type of E
   /// and issue an ErrorUnsupported style diagnostic (using the
   /// provided Name).