Clear the whole temporary directory before/after benchmarking (#6192)
Clear the whole temporary directory before/after benchmarking (#6192)

Avoid `cd`ing into the directory. The directory may not even
exist.
google/iree,iree-org/iree,iree-org/iree,google/iree,iree-org/iree,google/iree,iree-org/iree,iree-org/iree,google/iree,iree-org/iree,google/iree,google/iree,iree-org/iree,google/iree