Recently a change was made to this test in r294639 which fails when the

compiler is run in a mode where the default C++ standard is newer than C++03.
The reason is because one of the warnings checked is only produced when the
compiler is using C++03 or lower.

This change fixes this problem as well as adds explicit run lines to run the
test in C++03 and C++11 modes.

llvm-svn: 296066