re2: exclude benchlog results in .gitignore
re2: exclude benchlog results in .gitignore

Change-Id: I7854004ba7d6802b9d6e9ab9cc044ef8efe90fa6
Reviewed-on: https://code-review.googlesource.com/3081
Reviewed-by: Paul Wankadia <62d4e38bb1380f055ec4b899baa75e52af09c5f7@google.com>

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