[turbofan] Add RoundUint32ToFloat32 operator to Turbofan.

src/compiler/ppc/instruction-selector-ppc.cc

Index: src/compiler/ppc/instruction-selector-ppc.cc
diff --git a/src/compiler/ppc/instruction-selector-ppc.cc b/src/compiler/ppc/instruction-selector-ppc.cc
index 4992cf77b0ad6bef376fe9909a3f2869ed12dad3..5fd77ba95a9d2a9ab0512738b85348f422c79e1f 100644
--- a/src/compiler/ppc/instruction-selector-ppc.cc
+++ b/src/compiler/ppc/instruction-selector-ppc.cc
@@ -945,6 +945,11 @@ void InstructionSelector::VisitRoundInt32ToFloat32(Node* node) {
 }
 
 
+void InstructionSelector::VisitRoundUint32ToFloat32(Node* node) {
+  UNIMPLEMENTED();
+}
+
+
 void InstructionSelector::VisitChangeInt32ToFloat64(Node* node) {
   VisitRR(this, kPPC_Int32ToDouble, node);
 }