Minor fixups for auto deduction of initializer lists.

Fix some review comments.
Add a test for deduction when std::initializer_list isn't available yet.
Fix redundant error messages. This fixes and outstanding FIXME too.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@148735 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/SemaCXX/cxx0x-initializer-stdinitializerlist.cpp b/test/SemaCXX/cxx0x-initializer-stdinitializerlist.cpp
index 47ceaf0..fe3cd8f 100644
--- a/test/SemaCXX/cxx0x-initializer-stdinitializerlist.cpp
+++ b/test/SemaCXX/cxx0x-initializer-stdinitializerlist.cpp
@@ -1,5 +1,10 @@
 // RUN: %clang_cc1 -std=c++11 -fsyntax-only -verify %s
 
+// This must obviously come before the definition of std::initializer_list.
+void missing_initializerlist() {
+  auto l = {1, 2, 3, 4}; // expected-error {{std::initializer_list was not found}}
+}
+
 namespace std {
   typedef decltype(sizeof(int)) size_t;