Clean up dead code after spread desugaring

src/compiler/ast-loop-assignment-analyzer.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/compiler/ast-loop-assignment-analyzer.h"
 #include "src/compiler.h"
 #include "src/parsing/parser.h"
 
 namespace v8 {
 namespace internal {
@@ skipping 180 matching lines @@
   Visit(e->right());
 }
 
 
 void ALAA::VisitCompareOperation(CompareOperation* e) {
   Visit(e->left());
   Visit(e->right());
 }
 
 
-void ALAA::VisitSpread(Spread* e) { Visit(e->expression()); }
+void ALAA::VisitSpread(Spread* e) { UNREACHABLE(); }
 
 
 void ALAA::VisitEmptyParentheses(EmptyParentheses* e) { UNREACHABLE(); }
 
 
 void ALAA::VisitCaseClause(CaseClause* cc) {
   if (!cc->is_default()) Visit(cc->label());
   VisitStatements(cc->statements());
 }
 
@@ skipping 102 matching lines @@
   int count = 0;
   int var_index = AstLoopAssignmentAnalyzer::GetVariableIndex(scope, var);
   for (size_t i = 0; i < list_.size(); i++) {
     if (list_[i].second->Contains(var_index)) count++;
   }
   return count;
 }
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8