Revert of [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 34a98c22059661090825d3264ab0269e6d8e930e..69e797f6eb91b3f286d2cc63d89e9f006e27d4e8 100644
--- a/src/compiler/x64/instruction-selector-x64.cc
+++ b/src/compiler/x64/instruction-selector-x64.cc
@@ -831,12 +831,6 @@
 void InstructionSelector::VisitChangeFloat64ToUint32(Node* node) {
   X64OperandGenerator g(this);
   Emit(kSSEFloat64ToUint32, g.DefineAsRegister(node), g.Use(node->InputAt(0)));
-}
-
-
-void InstructionSelector::VisitTruncateFloat32ToInt64(Node* node) {
-  X64OperandGenerator g(this);
-  Emit(kSSEFloat32ToInt64, g.DefineAsRegister(node), g.Use(node->InputAt(0)));
 }