Revert STRICT_FCMP nonan optimisation

Summary: This reverts commit b7b61a7 which fails on some of the builders: http://lab.llvm.org:8011/#/builders/14/builds/5806

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Author: Thomas Preud'homme

llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp

@@ -7125,10 +7125,7 @@ void SelectionDAGBuilder::visitConstrainedFPIntrinsic(
   case ISD::STRICT_FSETCC:
   case ISD::STRICT_FSETCCS: {
     auto *FPCmp = dyn_cast<ConstrainedFPCmpIntrinsic>(&FPI);
-    ISD::CondCode Condition = getFCmpCondCode(FPCmp->getPredicate());
-    if (TM.Options.NoNaNsFPMath)
-      Condition = getFCmpCodeWithoutNaN(Condition);
-    Opers.push_back(DAG.getCondCode(Condition));
+    Opers.push_back(DAG.getCondCode(getFCmpCondCode(FPCmp->getPredicate())));
     break;
   }
   }