[PATCH 2/2] ARM: Improve fenv implementation

[Wilco]

Hi,

The second patch improves the fenv implementation by using the inline functions from fenv_private
where possible rather than duplicating functionality. The remaining functions are optimized in a
similar way to avoid unnecessary FPSCR writes (but no longer use __glibc_unlikely like in the
previous version).

OK for commit?

Wilco
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