[turbofan] Implemented the TruncateFloat32ToInt64 TurboFan operator.

src/compiler/typer.cc

Index: src/compiler/typer.cc
diff --git a/src/compiler/typer.cc b/src/compiler/typer.cc
index 6484c93edcb65118f0ccd1fcf0999f10bef4ef03..656223c4a41d20885d1f28072ecd8f23fb8a613b 100644
--- a/src/compiler/typer.cc
+++ b/src/compiler/typer.cc
@@ -2102,6 +2102,11 @@ Type* Typer::Visitor::TypeChangeFloat64ToUint32(Node* node) {
 }
 
 
+Type* Typer::Visitor::TypeTruncateFloat32ToInt64(Node* node) {
+  return Type::Internal();
+}
+
+
 Type* Typer::Visitor::TypeTruncateFloat64ToInt64(Node* node) {
   return Type::Internal();
 }