[Clang] -fprofile-sample-use option has not effect

[mikolaj-pirog]

Issuing clang -fprofile-sample-use file.cc has no effect: nothing is printed, binary isn't built with profiling info; the option seems to be ignored. When file is specified with fprofile-sample-use=profile.prof it works as expected. This is surprising, since similar option fprofile-use behaves differently -- when no file is specified, it looks for default.profdata in the current directory and prints error message when it doesn't find any. The fprofile-sample-use should behave as fprofile-use in this case