[turbofan] Implemented the TruncateFloat32ToInt64 TurboFan operator.

src/compiler/raw-machine-assembler.h

Index: src/compiler/raw-machine-assembler.h
diff --git a/src/compiler/raw-machine-assembler.h b/src/compiler/raw-machine-assembler.h
index 1898d1017daa33364557b1f3ae800b7615075f77..d48c24d616f16e9a9b984d9e1eafe05d992b6305 100644
--- a/src/compiler/raw-machine-assembler.h
+++ b/src/compiler/raw-machine-assembler.h
@@ -438,6 +438,9 @@ class RawMachineAssembler {
   Node* ChangeFloat64ToUint32(Node* a) {
     return AddNode(machine()->ChangeFloat64ToUint32(), a);
   }
+  Node* TruncateFloat32ToInt64(Node* a) {
+    return AddNode(machine()->TruncateFloat32ToInt64(), a);
+  }
   Node* TruncateFloat64ToInt64(Node* a) {
     return AddNode(machine()->TruncateFloat64ToInt64(), a);
   }