Antonio Sanchez ff07a8a639 GCC 4.8 arm EIGEN_OPTIMIZATION_BARRIER fix (#2315).
GCC 4.8 doesn't seem to like the `g` register constraint, failing to
compile with "error: 'asm' operand requires impossible reload".

Tested `r` instead, and that seems to work, even with latest compilers.

Also fixed some minor macro issues to eliminate warnings on armv7.

Fixes #2315.
2021-08-31 20:20:47 +00:00
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