[turbofan] Simplify handling of spreads in array literals.

src/compiler/ast-graph-builder.cc

Index: src/compiler/ast-graph-builder.cc
diff --git a/src/compiler/ast-graph-builder.cc b/src/compiler/ast-graph-builder.cc
index 561cd50395740d974d5e19b1af69c1847ecd0dd6..20c9577f080f3173a5995d56ca5dc88f85f630ab 100644
--- a/src/compiler/ast-graph-builder.cc
+++ b/src/compiler/ast-graph-builder.cc
@@ -1996,15 +1996,11 @@ void AstGraphBuilder::VisitArrayLiteral(ArrayLiteral* expr) {
   }
 
   // In case the array literal contains spread expressions it has two parts. The
-  // first part is  the "static" array which has a literal index is  handled
+  // first part is  the "static" array which has a literal index is handled
   // above. The second part is the part after the first spread expression
   // (inclusive) and these elements gets appended to the array. Note that the
   // number elements an iterable produces is unknown ahead of time.
-  bool has_spread = array_index < expr->values()->length();
-  if (has_spread) {
-    environment()->Pop();  // Array literal index.
-  }
-
+  environment()->Pop();  // Array literal index.
   for (; array_index < expr->values()->length(); array_index++) {
     Expression* subexpr = expr->values()->at(array_index);
     Node* array = environment()->Pop();
@@ -2032,9 +2028,6 @@ void AstGraphBuilder::VisitArrayLiteral(ArrayLiteral* expr) {
     environment()->Push(result);
   }
 
-  if (!has_spread) {
-    environment()->Pop();  // Array literal index.
-  }
   ast_context()->ProduceValue(environment()->Pop());
 }