[turbofan] Add TruncateFloat64ToInt32 machine operator.

src/compiler/instruction-selector.cc

Index: src/compiler/instruction-selector.cc
diff --git a/src/compiler/instruction-selector.cc b/src/compiler/instruction-selector.cc
index 335d85ad08fbee5772978d9a61752e5bc76b5af3..bec9f5dd39e2638705b9dc633c68aaf05b6c08ea 100644
--- a/src/compiler/instruction-selector.cc
+++ b/src/compiler/instruction-selector.cc
@@ -587,6 +587,8 @@ void InstructionSelector::VisitNode(Node* node) {
       return VisitChangeInt32ToInt64(node);
     case IrOpcode::kChangeUint32ToUint64:
       return VisitChangeUint32ToUint64(node);
+    case IrOpcode::kTruncateFloat64ToInt32:
+      return VisitTruncateFloat64ToInt32(node);
     case IrOpcode::kTruncateInt64ToInt32:
       return VisitTruncateInt64ToInt32(node);
     case IrOpcode::kFloat64Add:
@@ -690,6 +692,13 @@ void InstructionSelector::VisitInt64LessThanOrEqual(Node* node) {
 }
 
 
+void InstructionSelector::VisitTruncateFloat64ToInt32(Node* node) {
+  OperandGenerator g(this);
+  Emit(kArchTruncateDoubleToI, g.DefineAsRegister(node),
+       g.UseDoubleRegister(node->InputAt(0)));
+}
+
+
 void InstructionSelector::VisitFloat64Equal(Node* node) {
   FlagsContinuation cont(kUnorderedEqual, node);
   VisitFloat64Compare(node, &cont);