[turbofan] Add the TruncateFloat32ToInt32 operator to turbofan.

src/compiler/ia32/instruction-selector-ia32.cc

Index: src/compiler/ia32/instruction-selector-ia32.cc
diff --git a/src/compiler/ia32/instruction-selector-ia32.cc b/src/compiler/ia32/instruction-selector-ia32.cc
index 090645212e9f16928258f3ce0fa1104dd0fd83ad..946ab8d89bc3f3e1017a88f47d0c5347a4f110ab 100644
--- a/src/compiler/ia32/instruction-selector-ia32.cc
+++ b/src/compiler/ia32/instruction-selector-ia32.cc
@@ -705,6 +705,11 @@ void InstructionSelector::VisitChangeUint32ToFloat64(Node* node) {
 }
 
 
+void InstructionSelector::VisitTruncateFloat32ToInt32(Node* node) {
+  VisitRO(this, node, kSSEFloat32ToInt32);
+}
+
+
 void InstructionSelector::VisitChangeFloat64ToInt32(Node* node) {
   VisitRO(this, node, kSSEFloat64ToInt32);
 }