anticipate back-end when inlining fxdiv-and-mod #894
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At optimize-level 3, cp0 can replace calls to
fxdiv-and-mod, where the second argument is constant, with calls tofxdivandfxmodthat the back-end does not inline (when the constant is not a power of two). This aims to address issue #892 by helping cp0 anticipate how the back-end will handle the transformed code.