[turbofan] Add the TruncateFloat32ToInt32 operator to turbofan.

src/compiler/arm64/instruction-selector-arm64.cc

Index: src/compiler/arm64/instruction-selector-arm64.cc
diff --git a/src/compiler/arm64/instruction-selector-arm64.cc b/src/compiler/arm64/instruction-selector-arm64.cc
index 1ec5ab4c41a59a08d680582b08e9d4db04dd0e7a..fc2067ae4d756df696656a81a8ce6bfa8ff2b739 100644
--- a/src/compiler/arm64/instruction-selector-arm64.cc
+++ b/src/compiler/arm64/instruction-selector-arm64.cc
@@ -1229,6 +1229,11 @@ void InstructionSelector::VisitChangeUint32ToFloat64(Node* node) {
 }
 
 
+void InstructionSelector::VisitTruncateFloat32ToInt32(Node* node) {
+  VisitRR(this, kArm64Float32ToInt32, node);
+}
+
+
 void InstructionSelector::VisitChangeFloat64ToInt32(Node* node) {
   VisitRR(this, kArm64Float64ToInt32, node);
 }