Fix test file names so they're picked up by lit.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@226776 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/Modules/merge-anon-in-template.cc b/test/Modules/merge-anon-in-template.cpp
similarity index 100%
rename from test/Modules/merge-anon-in-template.cc
rename to test/Modules/merge-anon-in-template.cpp

diff --git a/test/Modules/merge-name-for-linkage.cc b/test/Modules/merge-name-for-linkage.cpp
similarity index 100%
rename from test/Modules/merge-name-for-linkage.cc
rename to test/Modules/merge-name-for-linkage.cpp