Update tools/get_about_memory.py so it can pull GC/CC logs, with the --gc-logs option.
Revert "Update tools/get_about_memory.py so it can pull GC/CC logs, with the --gc-logs option."

I am an idiot; I already wrote a tool to do this, called get_gc_cc_logs.py.

This reverts commit b0aab814e42eb07ded086de010cffca88eb310d5.
Unbitrot tools/get_gc_cc_log.py, so it works again.

Also let the script get abbreviated gc logs, after bug 890135.
Bug 891217: add emulator-x86-jb. r=mwu