The commandline flag to specify a particular openmp devicertl library
currently errors like:
fatal error: cannot open file './runtimes/runtimes-bins/openmp/libomptarget': Is a directory
CommonArgs successfully appends the directory to the commandline args then
mlink-builtin-bitcode rejects it.
This patch is a point fix to that. If --libomptarget-amdgcn-bc-path=directory
then append the expected name for the current architecture and go on as before.
This is useful for test runners that don't hardcode the architecture.