[turbofan] Implemented the TruncateFloat32ToInt64 TurboFan operator.

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 e03e52bb7195a49b310ffad00e1fd985bd6b25b3..aa5cd3544adc02994293a8c65007515376a3263d 100644
--- a/src/compiler/x64/instruction-selector-x64.cc
+++ b/src/compiler/x64/instruction-selector-x64.cc
@@ -834,6 +834,12 @@ void InstructionSelector::VisitChangeFloat64ToUint32(Node* node) {
 }
 
 
+void InstructionSelector::VisitTruncateFloat32ToInt64(Node* node) {
+  X64OperandGenerator g(this);
+  Emit(kSSEFloat32ToInt64, g.DefineAsRegister(node), g.Use(node->InputAt(0)));
+}
+
+
 void InstructionSelector::VisitTruncateFloat64ToInt64(Node* node) {
   X64OperandGenerator g(this);
   Emit(kSSEFloat64ToInt64, g.DefineAsRegister(node), g.Use(node->InputAt(0)));