[turbofan] Add TruncateFloat32ToUint32 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..12065d0ff6c84c65b60affa8fb26f759af756ef1 100644
--- a/src/compiler/ppc/instruction-selector-ppc.cc
+++ b/src/compiler/ppc/instruction-selector-ppc.cc
@@ -1020,6 +1020,11 @@ void InstructionSelector::VisitTruncateFloat32ToInt32(Node* node) {
 }
 
 
+void InstructionSelector::VisitTruncateFloat32ToUint32(Node* node) {
+  UNIMPLEMENTED();
+}
+
+
 #if V8_TARGET_ARCH_PPC64
 void InstructionSelector::VisitTruncateInt64ToInt32(Node* node) {
   // TODO(mbrandy): inspect input to see if nop is appropriate.