Cherry-pick upstream r237929

test/CodeGenCXX/mangle-exprs.cpp

 // RUN: %clang_cc1 -std=c++11 -emit-llvm %s -o - -triple=x86_64-apple-darwin9 | FileCheck %s
 
 namespace std {
   typedef decltype(sizeof(int)) size_t;
 
   // libc++'s implementation
   template <class _E>
   class initializer_list
   {
     const _E* __begin_;
@@ skipping 311 matching lines @@
     fC1(1); // CHECK-LABEL: define {{.*}} @_ZN5test73fC1IiEEDTcmtlNS_1CEilLi1ELi2EEEcvT__EES2_
     fC2(1); // CHECK-LABEL: define {{.*}} @_ZN5test73fC2IiEEDTcmcvNS_1CEilLi1ELi2EEcvT__EES2_
     fD1(1); // CHECK-LABEL: define {{.*}} @_ZN5test73fD1IiEEDTcmtlNS_1DEL_ZNS_1bEEEcvT__EES2_
     fD2(1); // CHECK-LABEL: define {{.*}} @_ZN5test73fD2IiEEDTcmcvNS_1DEL_ZNS_1bEEcvT__EES2_
     fE1(1); // CHECK-LABEL: define {{.*}} @_ZN5test73fE1IiEEDTcmtlNS_1EELi1ELi2EEcvT__EES2_
     fE2(1); // CHECK-LABEL: define {{.*}} @_ZN5test73fE2IiEEDTcmcvNS_1EEilLi1ELi2EEcvT__EES2_
     fF1(1); // CHECK-LABEL: define {{.*}} @_ZN5test73fF1IiEEDTcmtlNS_1FEilLi1ELi2EEEcvT__EES2_
     fF2(1); // CHECK-LABEL: define {{.*}} @_ZN5test73fF2IiEEDTcmcvNS_1FEilLi1ELi2EEcvT__EES2_
   }
 }
+
+
+namespace test8 {
+  template <class>
+  struct X {
+    template<typename T> T foo() const { return 0; }
+    template <class T> auto bar() const -> decltype(foo<T>()) { return 0; }
+  };
+
+  // CHECK-LABEL: define weak_odr i32 @_ZNK5test81XIiE3barIiEEDTcl3fooIT_EEEv
+  template int X<int>::bar<int>() const;
+}