Clean up dead code after spread desugaring

src/crankshaft/hydrogen.cc

Index: src/crankshaft/hydrogen.cc
diff --git a/src/crankshaft/hydrogen.cc b/src/crankshaft/hydrogen.cc
index 72a56762cbe7dfaad3f9face80438e704ced3ad6..ab73f540bc413c4c88dc3c66bb3708488ebce526 100644
--- a/src/crankshaft/hydrogen.cc
+++ b/src/crankshaft/hydrogen.cc
@@ -6069,9 +6069,7 @@ void HOptimizedGraphBuilder::VisitArrayLiteral(ArrayLiteral* expr) {
 
   for (int i = 0; i < length; i++) {
     Expression* subexpr = subexprs->at(i);
-    if (subexpr->IsSpread()) {
-      return Bailout(kSpread);
-    }
+    DCHECK(!subexpr->IsSpread());
 
     // If the subexpression is a literal or a simple materialized literal it
     // is already set in the cloned array.