[Remarks][Driver] Run dsymutil when remarks are enabled

When clang is invoked with a source file without -c or -S, it creates a
cc1 job, a linker job and if debug info is requested, a dsymutil job. In
case of remarks, we should also create a dsymutil job to avoid losing
the remarks that will be generated in a tempdir that gets removed.

Differential Revision: https://reviews.llvm.org/D71675