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(*)Parenthesize MOM_calc_varT for FMAs
Added parentheses to 2 lines in MOM_calc_varT so that they will be rotationally invariant when fused-multiply-adds are enabled. In this case, FMAs can still be applied to the impacted lines, exploiting that the masks are always 0 or 1. Also added parentheses to 2 other lines used to generate the stochastic pattern for rotational symmetry with FMAs. All answers are bitwise identical in cases without FMAs, but answers could change with FMAs.
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