[PATCH] libm/math: Use __math_xflow in obsolete math code

[Keith Packard]

Szabolcs Nagy <szabolcs.nagy@arm.com> writes:

> either you got lucky or you use another compiler
> than i do.

Yeah. Just lucky. Thanks for the warning. My fenv tests in picolibc are
using 'volatile' to force the desired order-of-operations.

        https://github.com/keith-packard/picolibc/blob/main/test/fenv.c

This gets tested in a huge range of configurations on RISC-V, x86 and
ARM and generates the expected results in all of them.

-- 
-keith
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