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cpu: reorder: tentatively turn ref direct copy code for gcc
Rationale: jitted code is typically faster than reference code compiled with old GCC (4.8.3). However jitted code requires significant creation time, so if someone always creates reorders prior to its execution jitted code might become slower than simple reference code. This commit is tentative. Intel MKL-DNN team needs to find out a way to make jitting less expensive... especially for such auxiliary and quite popular stuff like direct copy and other reorders. (cherry picked from commit 44b09b8)
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