There is no SSE remainder instruction, and LLVM does not invent one: at -O0
it lowers frem to fmod or fmodf. The backend now calls those two symbols
rather than refusing the operator, which is agreement by construction rather
than a second hand-written identity that would have to get every rounding,
every signed zero and every infinity right on its own.
Rem was the only gap. emit.ml's float surface is Add, Sub, Mul, Div, Rem and
the six comparisons; x86 had everything but Rem, and its comparisons already
build LLVM's ordered predicates out of ucomis, setcc and setnp.
math3.flan grows the operator spelling beside the fmod-f32/fmod-f64 calls it
already had, through globals so the pair is not folded before either backend
sees an operator. FIX.org records the ruling the fix came from.
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