clang-plugins: Don't strip non const references in auto raw ptr fixits.

tools/clang/plugins/tests/auto_raw_pointer.cpp

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-class Foo {};
+#include <utility>

[Nico, 2016/07/01 20:00:26]

This new test fails on the mac upload bots:
https://build.chromium.org/p/tryserver.chromium.mac/builders/mac_upload_clang...
(see bottom)

The plugin tests are supposed to be standalone, please don't include system
headers here (some other tests stub out just the bits they need, see there for
reference).

This is currently blocking clang rolls; please take a look.

+
+class Foo {
+ public:
+  void foo() {}
+};
 
 void f();
 
 int main() {
   int integer;
   Foo foo;
 
   auto int_copy = integer;
   const auto const_int_copy = integer;
   const auto& const_int_ref = integer;
@@ skipping 12 matching lines @@
   auto* raw_foo_ptr_valid = &foo;
   const auto* const_raw_foo_ptr_valid = &foo;
 
   int *int_ptr;
 
   auto double_ptr_auto = &int_ptr;
   auto* double_ptr_auto_ptr = &int_ptr;
   auto** double_ptr_auto_double_ptr = &int_ptr;
 
   auto function_ptr = &f;
+  auto method_ptr = &Foo::foo;
 
   int *const *const volatile **const *pointer_awesomeness;
   auto auto_awesome = pointer_awesomeness;
+
+  auto& int_ptr_ref = int_ptr;
+  const auto& const_int_ptr_ref = int_ptr;
+  auto&& int_ptr_rref = std::move(int_ptr);
+  const auto&& const_int_ptr_rref = std::move(int_ptr);
 }