fpu: convert float[16/32/64]_squash_denormal to new modern style

This also allows us to remove the extractFloat16exp/frac helpers. We
avoid using the floatXX_pack_raw functions as they are slight overkill
for masking out all but the top bit of the number. The generated code
is almost exactly the same as makes no difference to the
pre-conversion code.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>

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