Clean up dead code after spread desugaring

src/crankshaft/typing.cc

Index: src/crankshaft/typing.cc
diff --git a/src/crankshaft/typing.cc b/src/crankshaft/typing.cc
index df50f81167c8ad2476e900ce2b049318959c3e12..77171a637ff7e9db76da0fddd2b609c9f55b6ac9 100644
--- a/src/crankshaft/typing.cc
+++ b/src/crankshaft/typing.cc
@@ -752,7 +752,7 @@ void AstTyper::VisitCompareOperation(CompareOperation* expr) {
 }
 
 
-void AstTyper::VisitSpread(Spread* expr) { RECURSE(Visit(expr->expression())); }
+void AstTyper::VisitSpread(Spread* expr) { UNREACHABLE(); }
 
 
 void AstTyper::VisitEmptyParentheses(EmptyParentheses* expr) {
@@ -760,8 +760,7 @@ void AstTyper::VisitEmptyParentheses(EmptyParentheses* expr) {
 }
 
 
-void AstTyper::VisitThisFunction(ThisFunction* expr) {
-}
+void AstTyper::VisitThisFunction(ThisFunction* expr) {}
 
 
 void AstTyper::VisitSuperPropertyReference(SuperPropertyReference* expr) {}