[turbofan] Unify the PlainPrimitive as Number treatment.

src/compiler/representation-change.cc

Index: src/compiler/representation-change.cc
diff --git a/src/compiler/representation-change.cc b/src/compiler/representation-change.cc
index d9d07e6c6d93c49eb567df3b00318e833e7a5d0a..b65ad6bb435f4ca0262515d6c877e7be2943c464 100644
--- a/src/compiler/representation-change.cc
+++ b/src/compiler/representation-change.cc
@@ -663,10 +663,14 @@ const Operator* RepresentationChanger::Float64OperatorFor(
       return machine()->Float64Atan();
     case IrOpcode::kNumberAtan2:
       return machine()->Float64Atan2();
+    case IrOpcode::kNumberFround:
+      return machine()->TruncateFloat64ToFloat32();
     case IrOpcode::kNumberLog:
       return machine()->Float64Log();
     case IrOpcode::kNumberLog1p:
       return machine()->Float64Log1p();
+    case IrOpcode::kNumberSqrt:
+      return machine()->Float64Sqrt();
     case IrOpcode::kNumberSilenceNaN:
       return machine()->Float64SilenceNaN();
     default: