run-testmem should have a dry run option and an option to parse the stdout of executi...

run-testmem should have a dry run option and an option to parse the stdout of executing the dry run
https://bugs.webkit.org/show_bug.cgi?id=186293

Reviewed by Mark Lam.

This makes it easier to execute run-testmem on a device that doesn't have ruby
on it. run-testmem now has a --dry option that will output commands to execute
in bash. To run on a device that doesn't have ruby, just put its output into
a bash script, and copy the PerformanceTests/testmem directory onto that device,
and execute the bash script. Running that bash script will give you raw output.
Make a file with that output and pass it into run-testmem using the --parse option.
run-testmem will parse the raw output and compute the benchmark score.

* Scripts/run-testmem:

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@232517 268f45cc-cd09-0410-ab3c-d52691b4dbfc