new implementation for run #1383
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tejal29
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shd fix #1317 and #1316 Improve correctness for newly added "--use-new-run` flag
in this PR, instead of rely on file marker and only "Modtime", we store File info descriptors before running a command and compare it with after running the command.
We don't rely on creating hashes for file information as it has been identified as a bottle neck.
See graph
As the number of files increase, time spent in hashing increases