Roll src/third_party/re2/src/ b0a41e521..d8d0c66b9 (3 commits)

https://chromium.googlesource.com/external/github.com/google/re2.git/+log/b0a41e52137a..d8d0c66b9c07

$ git log b0a41e521..d8d0c66b9 --date=short --no-merges --format='%ad %ae %s'
2020-02-14 junyer Fix the check for Apple platforms. Mea culpa.
2020-02-14 junyer Provide hooks::context iff thread_local is supported.
2020-02-14 junyer Update doc/syntax.html.

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

R=mmoroz@chromium.org

Change-Id: If0e8f0224379fd2f9cd9441d05f6b4f8d0e552dd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2061170Reviewed-by: Nico Weber <thakis@chromium.org>
Commit-Queue: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#742022}

DEPS

@@ -1334,7 +1334,7 @@ deps = {
   },
 
   'src/third_party/re2/src':
-    Var('chromium_git') + '/external/github.com/google/re2.git' + '@' + 'b0a41e52137a4cae183dcf194faa007cd9a1c344',
+    Var('chromium_git') + '/external/github.com/google/re2.git' + '@' + 'd8d0c66b9c076b24aa9d622096b7debfb4a541fa',
 
   'src/third_party/r8': {
       'packages': [