Antonio Sanchez 07cc362238 Fix EIGEN_OPTIMIZATION_BARRIER for arm-clang.
Clang doesn't like !621, needs the "g" constraint back.
The "g" constraint also works for GCC >= 5.

This fixes our gitlab CI.


(cherry picked from commit 3a6296d4f198ffbcccda4303919b3b14d5e54524)
2021-09-01 16:40:08 +00:00
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