[turbofan] Don't eliminate unused CheckFloat64Hole.

src/compiler/simplified-lowering.cc

Index: src/compiler/simplified-lowering.cc
diff --git a/src/compiler/simplified-lowering.cc b/src/compiler/simplified-lowering.cc
index 9126c2a2821c41fb8dd7cc2053d33ff740a96906..598795b4bb4ddde04517326e559fdf6d75965ed7 100644
--- a/src/compiler/simplified-lowering.cc
+++ b/src/compiler/simplified-lowering.cc
@@ -2555,7 +2555,6 @@ class RepresentationSelector {
         return;
       }
       case IrOpcode::kCheckFloat64Hole: {
-        if (truncation.IsUnused()) return VisitUnused(node);
         CheckFloat64HoleMode mode = CheckFloat64HoleModeOf(node->op());
         ProcessInput(node, 0, UseInfo::TruncatingFloat64());
         ProcessRemainingInputs(node, 1);