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implement timer implementation for mips platform

Signed-off-by: Khem Raj <raj.khem@gmail.com>
--- a/utilities/transactions/lock/range/range_tree/lib/portability/toku_time.h
+++ b/utilities/transactions/lock/range/range_tree/lib/portability/toku_time.h
@@ -155,7 +155,12 @@ static inline tokutime_t toku_time_now(v
   __asm __volatile__("rdcycle %0" : "=r"(result));
   return result;
 #endif
-
+#elif defined(__mips__)
+  // mips apparently only allows rdtsc for superusers, so we fall
+  // back to gettimeofday.  It's possible clock_gettime would be better.
+  struct timeval tv;
+  gettimeofday(&tv, nullptr);
+  return (uint64_t)tv.tv_sec * 1000000 + tv.tv_usec;
 #else
 #error No timer implementation for this platform
 #endif