Make the RE2 fuzzer ignore inputs larger than 1KiB.
Make the RE2 fuzzer ignore inputs larger than 1KiB.

The hope is to find a "sweet spot" for fuzzing: high coverage and high
speed. At the moment, we waste too much time on very large inputs that
give us very little.

Change-Id: I94ee93f1d5293c63dc5fd749f47087cdc7acd43f
Reviewed-on: https://code-review.googlesource.com/10790
Reviewed-by: Paul Wankadia <62d4e38bb1380f055ec4b899baa75e52af09c5f7@google.com>

google/re2,google/re2,google/re2,google/re2,google/re2