Fix Issue 633: random segfaults in RimeTableTest with --gtest_shuffle.
Fix Issue 633: random segfaults in RimeTableTest with --gtest_shuffle.

j717273419/librime,rime/librime,bygloam/librime,rwduzhao/librime,Prcuvu/librime,rwduzhao/librime,kionz/librime,Prcuvu/librime,Prcuvu/librime,j717273419/librime,jakwings/librime,rwduzhao/librime,Prcuvu/librime,bygloam/librime,rime/librime,rime/librime,kionz/librime,jakwings/librime,bygloam/librime,Prcuvu/librime,jakwings/librime,rime/librime,kionz/librime,j717273419/librime,kionz/librime