Rename warn-unused-member.cpp to warn-unused-private-field.cpp to

make it match the flag it tests.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@160536 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/SemaCXX/warn-unused-member.cpp b/test/SemaCXX/warn-unused-private-field.cpp
similarity index 100%
rename from test/SemaCXX/warn-unused-member.cpp
rename to test/SemaCXX/warn-unused-private-field.cpp