Updated to most recent version RE2 and remove upstreamed patches.

third_party/re2/patches/msvc-x64.patch

-diff --git a/third_party/re2/re2/dfa.cc b/third_party/re2/re2/dfa.cc
-index 32c8c33..36ec66f 100644
---- a/third_party/re2/re2/dfa.cc
-+++ b/third_party/re2/re2/dfa.cc
-@@ -470,8 +470,8 @@ DFA::DFA(Prog* prog, Prog::MatchKind kind, int64 max_mem)
-   // At minimum, the search requires room for two states in order
-   // to limp along, restarting frequently.  We'll get better performance
-   // if there is room for a larger number of states, say 20.
--  int one_state = sizeof(State) + (prog_->size()+nmark)*sizeof(int) +
--                  (prog_->bytemap_range()+1)*sizeof(State*);
-+  size_t one_state = sizeof(State) + (prog_->size()+nmark)*sizeof(int) +
-+                     (prog_->bytemap_range()+1)*sizeof(State*);
-   if (state_budget_ < 20*one_state) {
-     LOG(INFO) << StringPrintf("DFA out of memory: prog size %lld mem %lld",
-                               prog_->size(), max_mem);
-diff --git a/third_party/re2/util/logging.h b/third_party/re2/util/logging.h
-index 7302ea6..4478f9b 100644
---- a/third_party/re2/util/logging.h
-+++ b/third_party/re2/util/logging.h
-@@ -59,7 +59,11 @@ class LogMessage {
-   void Flush() {
-     stream() << "\n";
-     string s = str_.str();
-+#ifdef WIN32
-+    write(2, s.data(), static_cast<unsigned int>(s.size()));
-+#else
-     if(write(2, s.data(), s.size()) < 0) {}  // shut up gcc
-+#endif
-     flushed_ = true;
-   }
-   ~LogMessage() {