add a command line parameter: --small-log, output log to a limited size FILE, but log is always up to date #136
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modify command line parameter
-l: output all log to a file with unlimited size, so the file maybe 10G or 100G.
--small-file: output log to a file with limited size when nemu end the program instead of "ctrl + c", the log in the file is always information near the end of the program. For example, when difftest find a bug, small log will save some log that output before executing the error instruction, instead of save all log from the start of program to the end.