Fix depfile name construction

Fix depfile name construction

- When using -o, the provided filename is using for constructing the depfile
  name (when -MMD is passed).
- The logic looks for the rightmost '.' character and replaces what comes after
  with 'd'.
- This works incorrectly when the filename has no extension and the directories
  have '.' in them (e.g. out.dir/test)
- This replaces the funciton to just llvm::sys::path functionality

Differential Revision: https://reviews.llvm.org/D67542

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@371853 91177308-0d34-0410-b5e6-96231b3b80d8