Remove a pointer chase from the DFA fast path.
Remove a pointer chase from the DFA fast path.

Testing with the Search_Hard_CachedDFA benchmark indicated a geometric
mean improvement in throughput (i.e. bytes per second) of nearly 40%.

Change-Id: I5f984e212e4a4ede4292dbfa441c45f3a8a061a1
Reviewed-on: https://code-review.googlesource.com/4093
Reviewed-by: Paul Wankadia <62d4e38bb1380f055ec4b899baa75e52af09c5f7@google.com>

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