test/CodeGenCXX/dllexport.cpp: don't instantiate templates in USEMEMFUNC macro
test/CodeGenCXX/dllexport.cpp: don't instantiate templates in USEMEMFUNC macro

Use the derived class in the macro instead, to make it unambigous where
the template is being instantiated.

git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@216142 91177308-0d34-0410-b5e6-96231b3b80d8

apple/swift-clang,llvm-mirror/clang,apple/swift-clang,llvm-mirror/clang,llvm-mirror/clang,apple/swift-clang,llvm-mirror/clang,apple/swift-clang,llvm-mirror/clang,llvm-mirror/clang,llvm-mirror/clang,apple/swift-clang,apple/swift-clang,apple/swift-clang,apple/swift-clang,llvm-mirror/clang,llvm-mirror/clang,apple/swift-clang,llvm-mirror/clang,apple/swift-clang