[turbofan] Add the TruncateFloat32ToInt32 operator to turbofan.

src/compiler/x64/instruction-selector-x64.cc

Index: src/compiler/x64/instruction-selector-x64.cc
diff --git a/src/compiler/x64/instruction-selector-x64.cc b/src/compiler/x64/instruction-selector-x64.cc
index c47a42eefe3da6684257f8cbfa9bdc6f3c2a661d..4e990d47ea26dba90ab144ed06cbde1640028ea0 100644
--- a/src/compiler/x64/instruction-selector-x64.cc
+++ b/src/compiler/x64/instruction-selector-x64.cc
@@ -857,6 +857,12 @@ void InstructionSelector::VisitChangeFloat64ToUint32(Node* node) {
 }
 
 
+void InstructionSelector::VisitTruncateFloat32ToInt32(Node* node) {
+  X64OperandGenerator g(this);
+  Emit(kSSEFloat32ToInt32, g.DefineAsRegister(node), g.Use(node->InputAt(0)));
+}
+
+
 void InstructionSelector::VisitTryTruncateFloat32ToInt64(Node* node) {
   X64OperandGenerator g(this);
   InstructionOperand inputs[] = {g.UseRegister(node->InputAt(0))};