[es6] support rest parameters in arrow functions (alternative)

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

Index: src/compiler/ast-loop-assignment-analyzer.cc
diff --git a/src/compiler/ast-loop-assignment-analyzer.cc b/src/compiler/ast-loop-assignment-analyzer.cc
index 4028b9412ba8e3647e02a8326ae531847057849e..7f22853c253b5838448a28862b631bc869903128 100644
--- a/src/compiler/ast-loop-assignment-analyzer.cc
+++ b/src/compiler/ast-loop-assignment-analyzer.cc
@@ -195,6 +195,11 @@ void ALAA::VisitCompareOperation(CompareOperation* e) {
 }
 
 
+void ALAA::VisitSpread(Spread* e) {
+  UNREACHABLE();
+}
+
+
 void ALAA::VisitCaseClause(CaseClause* cc) {
   if (!cc->is_default()) Visit(cc->label());
   VisitStatements(cc->statements());