[cfe-dev] [test-suite] making polybench/symm succeed with "-Ofast" and "-ffp-contract=on"

[Sebastian Pop via cfe-dev]

polybench/linear-algebra/solvers/gramschmidt/ exposes the same problems as symm.
It does not match the reference output at -O0 -ffp-contract=off,
and it only passes all elements comparisons for FP_ABSTOLERANCE=1 for
"-Ofast" vs. "-O0 -ffp-contract=off".