Merge tag 'pull-fpu-20260509' of https://gitlab.com/rth7680/qemu into staging

fpu: Cleanups and export FloatParts{64,128} internals,
     so far with a limited number of primitives.
host-utils: Introduce signed saturation primitives

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* tag 'pull-fpu-20260509' of https://gitlab.com/rth7680/qemu: (28 commits)
  host-utils: Introduce signed saturation primitives
  fpu: Drop QEMU_FLATTEN from muladd routines
  fpu: Return struct from parts{64,128}_addsub
  fpu: Return struct from parts{64,128}_mul
  fpu: Export parts{64,128}_compare
  fpu: Split scalbn from partsN(muladd_scalbn)
  fpu: Introduce record_denormals_used
  fpu: Return struct from parts{64,128}_pick_nan_muladd
  fpu: Introduce parts64_round_to_fmt
  fpu: Export default_nan, pick_nan, return_nan routines
  fpu: Return struct from parts{64,128}_round_to_int
  fpu: Return struct from parts{64,128}_div
  fpu: Return struct from parts{64,128}_pick_nan
  fpu: Sink exp_bias adjustment in float64r32_pack_raw
  fpu: Return struct from parts{64,128}_return_nan
  fpu: Return struct from parts{64,128}_silence_nan
  fpu: Return struct from parts{64,128}_default_nan
  fpu: Export unpack_canonical and round_pack_canonical routines
  fpu: Export FloatFmt structures
  fpu: Split FloatParts{64,128} to softfloat-parts.h
  ...

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>