Basic TurboFan support for rest arguments.

src/ast/ast-numbering.cc

Index: src/ast/ast-numbering.cc
diff --git a/src/ast/ast-numbering.cc b/src/ast/ast-numbering.cc
index 45f05f38e625053645652fe0b8bd76525f2e18c7..6bfd514fbbb0f41909a735de588d124783eb2e73 100644
--- a/src/ast/ast-numbering.cc
+++ b/src/ast/ast-numbering.cc
@@ -585,6 +585,11 @@ bool AstNumberingVisitor::Renumber(FunctionLiteral* node) {
     DisableCrankshaft(kContextAllocatedArguments);
   }
 
+  int rest_index;
+  if (scope->rest_parameter(&rest_index)) {
+    DisableCrankshaft(kRestParameter);
+  }
+
   VisitDeclarations(scope->declarations());
   VisitStatements(node->body());