[turbofan] Implemented the TruncateFloat32ToUint64 TurboFan operator.

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 337e6167d6acd3ff5ec537f4cb43c398afbfc62c..c11b4f26705f34c57b84a4d081d71e3c2dcd9f65 100644
--- a/src/compiler/ppc/instruction-selector-ppc.cc
+++ b/src/compiler/ppc/instruction-selector-ppc.cc
@@ -937,6 +937,11 @@ void InstructionSelector::VisitTruncateFloat64ToInt64(Node* node) {
 }
 
 
+void InstructionSelector::VisitTruncateFloat32ToUint64(Node* node) {
+  UNIMPLEMENTED();
+}
+
+
 void InstructionSelector::VisitTruncateFloat64ToUint64(Node* node) {
   VisitRR(this, kPPC_DoubleToUint64, node);
 }