[profile] Disable instrprof-get-filename-merge-mode.c on Windows

The Windows bots are failing with:

clang: warning: argument unused during compilation: '-dynamiclib' [-Wunused-command-line-argument]
llvm-svn: 375315

diff --git a/compiler-rt/test/profile/instrprof-get-filename-merge-mode.c b/compiler-rt/test/profile/Posix/instrprof-get-filename-merge-mode.c
similarity index 100%
rename from compiler-rt/test/profile/instrprof-get-filename-merge-mode.c
rename to compiler-rt/test/profile/Posix/instrprof-get-filename-merge-mode.c