stupidgcm: add benchmark.bash wrapper
stupidgcm: add benchmark.bash wrapper

Add a simple bash wrapper to make it easier to run the GCM
benchmarks.

rfjakob/gocryptfs,rfjakob/gocryptfs,davesteele/gocryptfs,rfjakob/gocryptfs,davesteele/gocryptfs,davesteele/gocryptfs,rfjakob/gocryptfs