[llvm] Vectorize: Support fminimumnum and fmaximumnum (PR #131781)

[YunQiang Su via llvm-commits]

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@@ -2776,6 +2776,12 @@ class BasicTTIImplBase : public TargetTransformInfoImplCRTPBase<T> {
       }
       return Cost;
     }
+    case Intrinsic::maximumnum:
+    case Intrinsic::minimumnum: {
+      if (TLI->isOperationLegalOrPromote(llvm::ISD::FMAXNUM_IEEE, LT.second))
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wzssyqa wrote:

If so, the problem will be quite complicated: different architecture uses different `fcanonical`.
LoongArch uses `min`
MIPSr6 uses `max`
AArch64 uses `max`
Maybe we can use `max && min` here. 

https://github.com/llvm/llvm-project/pull/131781