Roll src/third_party/re2/src/ bb8e77755..f71aaa0be (3 commits)

https://chromium.googlesource.com/external/github.com/google/re2.git/+log/bb8e777557dd..f71aaa0be84a

$ git log bb8e77755..f71aaa0be --date=short --no-merges --format='%ad %ae %s'
2019-12-29 junyer Make DFA use hints.
2019-12-13 junyer std::is_pod<> was deprecated in C++20.
2019-12-09 junyer Simplify the bytecode for the 80-10FFFF rune range.

Created with:
  roll-dep src/third_party/re2/src

R=mmoroz@chromium.org

Change-Id: I47de205ccacde2054daf2b6b81cb09ccf4a1a375
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1983509Reviewed-by: Nico Weber <thakis@chromium.org>
Reviewed-by: Max Moroz <mmoroz@chromium.org>
Commit-Queue: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#727987}

DEPS

@@ -1379,7 +1379,7 @@ deps = {
   },
 
   'src/third_party/re2/src':
-    Var('chromium_git') + '/external/github.com/google/re2.git' + '@' + 'bb8e777557ddbdeabdedea4f23613c5021ffd7b1',
+    Var('chromium_git') + '/external/github.com/google/re2.git' + '@' + 'f71aaa0be84a7b401bc6494488880f3b17b5bca9',
 
   'src/third_party/r8': {
       'packages': [