[turbofan] Add TruncationMode for TruncateFloat64ToInt32.

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

Index: src/compiler/arm/instruction-selector-arm.cc
diff --git a/src/compiler/arm/instruction-selector-arm.cc b/src/compiler/arm/instruction-selector-arm.cc
index d9f8f8b1de5bdf92010aaff3c02f4d759909da0a..885538804830594c3ab7529a16ee492cd20dc7f4 100644
--- a/src/compiler/arm/instruction-selector-arm.cc
+++ b/src/compiler/arm/instruction-selector-arm.cc
@@ -914,6 +914,17 @@ void InstructionSelector::VisitTruncateFloat64ToFloat32(Node* node) {
 }
 
 
+void InstructionSelector::VisitTruncateFloat64ToInt32(Node* node) {
+  switch (TruncationModeOf(node->op())) {
+    case TruncationMode::kJavaScript:
+      return VisitRR(this, kArchTruncateDoubleToI, node);
+    case TruncationMode::kRoundToZero:
+      return VisitRR(this, kArmVcvtS32F64, node);
+  }
+  UNREACHABLE();
+}
+
+
 void InstructionSelector::VisitFloat32Add(Node* node) {
   ArmOperandGenerator g(this);
   Float32BinopMatcher m(node);