[GlobalIsel] Combine logic of floating point compares (#81886)

It is purely based on symmetry. Registers can be scalars, vectors, and
non-constants.

X < 5.0 || X > 5.0
  ->
X != 5.0

X < Y && X > Y
  ->
  FCMP_FALSE

X < Y && X < Y
  ->
  FCMP_TRUE

see InstCombinerImpl::foldLogicOfFCmps