Fix unit tests compilation by non-gnu/msvc compilers with c++11 support. #1691
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donotoptimize_test.cc could not be compiled under non-gnu / non-msvc compilers, because only deprecated version of DoNotOptimize is available for these compilers. Tests are compiled with -Werror. Patch fixes test compilation by providing non-deprecated version of DoNotOptimize for compilers with c++11 standard support.