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Use hardware Floating-point instruction fclass.{s/d} to implement
classification functions, i.e finite{f/ }, fpclassify{f/ }, isnan{f/ },
isinf{f/ }, issignaling{f/ }.
* sysdeps/loongarch/fpu/s_finite.c: New file.
* sysdeps/loongarch/fpu/s_finitef.c: Likewise.
* sysdeps/loongarch/fpu/s_fpclassify.c: Likewise.
* sysdeps/loongarch/fpu/s_fpclassifyf.c: Likewise.
* sysdeps/loongarch/fpu/s_isinf.c: Likewise.
* sysdeps/loongarch/fpu/s_isinff.c: Likewise.
* sysdeps/loongarch/fpu/s_isnan.c: Likewise.
* sysdeps/loongarch/fpu/s_isnanf.c: Likewise.
* sysdeps/loongarch/fpu/s_issignaling.c: Likewise.
* sysdeps/loongarch/fpu/s_issignalingf.c: Likewise.
* sysdeps/loongarch/fpu_control.h: Add _FCLASS_* macro.
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