MIPS: math-emu: Inline ieee754sp_issnan and ieee754dp_issnan.

Shaves another 16 bytes off but more importantly avoids function calls.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

diff --cc arch/mips/math-emu/ieee754dp.c
Simple merge

diff --cc arch/mips/math-emu/ieee754dp.h
Simple merge

diff --cc arch/mips/math-emu/ieee754sp.c
Simple merge

diff --cc arch/mips/math-emu/ieee754sp.h
Simple merge