PPC: [turbofan] Add the TruncateFloat32ToInt32 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 b2f4c06a1eb175af2acbba5404b2eb1eeca9c94c..4992cf77b0ad6bef376fe9909a3f2869ed12dad3 100644
--- a/src/compiler/ppc/instruction-selector-ppc.cc
+++ b/src/compiler/ppc/instruction-selector-ppc.cc
@@ -1015,6 +1015,11 @@ void InstructionSelector::VisitTruncateFloat64ToInt32(Node* node) {
 }
 
 
+void InstructionSelector::VisitTruncateFloat32ToInt32(Node* node) {
+  return VisitRR(this, kPPC_DoubleToInt32, node);
+}
+
+
 #if V8_TARGET_ARCH_PPC64
 void InstructionSelector::VisitTruncateInt64ToInt32(Node* node) {
   // TODO(mbrandy): inspect input to see if nop is appropriate.