Revert of Update re2

third_party/re2/util/benchmark.cc

Index: third_party/re2/util/benchmark.cc
diff --git a/third_party/re2/util/benchmark.cc b/third_party/re2/util/benchmark.cc
index b77e22d781ae02ccf9a9d0bd832df87e2b780d8c..c3aad7ed89ad48654c8d00ffa9ecfbfcf6fafc7a 100644
--- a/third_party/re2/util/benchmark.cc
+++ b/third_party/re2/util/benchmark.cc
@@ -25,29 +25,10 @@
 }
 
 static int64 nsec() {
-#if defined(__APPLE__)
 	struct timeval tv;
 	if(gettimeofday(&tv, 0) < 0)
 		return -1;
 	return (int64)tv.tv_sec*1000*1000*1000 + tv.tv_usec*1000;
-#elif defined(_WIN32)
-	// https://msdn.microsoft.com/en-us/library/windows/desktop/dn553408.aspx
-	// describes how to query ticks and convert to microseconds. Of course,
-	// what we want in this case are nanoseconds. Also, note that .QuadPart
-	// is a signed 64-bit integer, so casting to int64 shouldn't be needed.
-	LARGE_INTEGER freq;
-	QueryPerformanceFrequency(&freq);
-	LARGE_INTEGER ticks;
-	QueryPerformanceCounter(&ticks);
-	ticks.QuadPart *= 1000*1000*1000;
-	ticks.QuadPart /= freq.QuadPart;
-	return ticks.QuadPart;
-#else
-	struct timespec tp;
-	if(clock_gettime(CLOCK_REALTIME, &tp) < 0)
-		return -1;
-	return (int64)tp.tv_sec*1000*1000*1000 + tp.tv_nsec;
-#endif
 }
 
 static int64 bytes;
@@ -124,9 +105,9 @@
 	while(ns < (int)1e9 && n < (int)1e9) {
 		last = n;
 		if(ns/n == 0)
-			n = (int)1e9;
+			n = 1e9;
 		else
-			n = (int)1e9 / static_cast<int>(ns/n);
+			n = 1e9 / (ns/n);
 		
 		n = max(last+1, min(n+n/2, 100*last));
 		n = round(n);