Revert of Update re2

third_party/re2/re2/bitstate.cc

Index: third_party/re2/re2/bitstate.cc
diff --git a/third_party/re2/re2/bitstate.cc b/third_party/re2/re2/bitstate.cc
index 5740daa486679549cfb33ef569d35c6225c72cfa..518d6420127aa1e41dcb6a77625b7b19fc313616 100644
--- a/third_party/re2/re2/bitstate.cc
+++ b/third_party/re2/re2/bitstate.cc
@@ -94,7 +94,7 @@
 // If so, remember that it was visited so that the next time,
 // we don't repeat the visit.
 bool BitState::ShouldVisit(int id, const char* p) {
-  size_t n = id * (text_.size() + 1) + (p - text_.begin());
+  uint n = id * (text_.size() + 1) + (p - text_.begin());
   if (visited_[n/VisitedBits] & (1 << (n & (VisitedBits-1))))
     return false;
   visited_[n/VisitedBits] |= 1 << (n & (VisitedBits-1));
@@ -170,8 +170,6 @@
     Prog::Inst* ip = prog_->inst(id);
     switch (ip->opcode()) {
       case kInstFail:
-        return false;
-
       default:
         LOG(DFATAL) << "Unexpected opcode: " << ip->opcode() << " arg " << arg;
         return false;
@@ -272,8 +270,7 @@
         if (submatch_[0].data() == NULL ||
             (longest_ && p > submatch_[0].end())) {
           for (int i = 0; i < nsubmatch_; i++)
-            submatch_[i].set(cap_[2*i],
-                             static_cast<int>(cap_[2*i+1] - cap_[2*i]));
+            submatch_[i] = StringPiece(cap_[2*i], cap_[2*i+1] - cap_[2*i]);
         }
 
         // If going for first match, we're done.