mem-latency test: delete temporary 'core' variable after use
mem-latency test: delete temporary 'core' variable after use

I've already gotten dicked over by this: I ended up accidently using
"core" instead of "core0" which resulted in no error but extremely
confusing behaviour.

I really really really hate the lack of variable declarations and proper
lexical scoping in Python.  :(

mvduin/py-uio,mvduin/py-uio,mvduin/py-uio,mvduin/py-uio,mvduin/py-uio