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If f32 denormals were enabled pre-gfx9, we would still try to implement this with v_max_f32. Pre-gfx9, these instructions ignored the denormal mode and did not flush. Switch to the multiply form for f32 as a workaround which should always work in any case. This fixes conformance failures when the library implementation of fmin/fmax were accidentally not inlined, forcing the assumption of no flushing on targets where denormals are not enabled by default. This is a workaround, since really we should not be mixing code with different FP mode expectations, but prefer the lowering that will work in any mode. Now this will always use max to implement canonicalize on gfx9+. This is only really beneficial for f64. For f32/f16 it's a neutral choice (and worse in terms of code size in 1 case), but possibly worse for the compiler since it does add an extra register use operand. Leave this change for later.
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