Partial revert of rest parameter desugaring.

src/crankshaft/hydrogen.cc

 // Copyright 2013 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/crankshaft/hydrogen.h"
 
 #include <sstream>
 
 #include "src/allocation-site-scopes.h"
 #include "src/ast/ast-numbering.h"
@@ skipping 4665 matching lines @@
 
   AddInstruction(arguments_object);
   graph()->SetArgumentsObject(arguments_object);
 
   // Handle the arguments and arguments shadow variables specially (they do
   // not have declarations).
   if (scope->arguments() != NULL) {
     environment()->Bind(scope->arguments(), graph()->GetArgumentsObject());
   }
 
+  int rest_index;
+  Variable* rest = scope->rest_parameter(&rest_index);
+  if (rest) {
+    return Bailout(kRestParameter);
+  }
+
   if (scope->this_function_var() != nullptr ||
       scope->new_target_var() != nullptr) {
     return Bailout(kSuperReference);
   }
 
   // Trace the call.
   if (FLAG_trace && top_info()->IsOptimizing()) {
     Add<HCallRuntime>(Runtime::FunctionForId(Runtime::kTraceEnter), 0);
   }
 }
@@ skipping 3654 matching lines @@
       target_shared->DisableOptimization(kParseScopeError);
     }
     TraceInline(target, caller, "parse failure");
     return false;
   }
 
   if (target_info.scope()->num_heap_slots() > 0) {
     TraceInline(target, caller, "target has context-allocated variables");
     return false;
   }
+
+  int rest_index;
+  Variable* rest = target_info.scope()->rest_parameter(&rest_index);
+  if (rest) {
+    TraceInline(target, caller, "target uses rest parameters");
+    return false;
+  }
+
   FunctionLiteral* function = target_info.literal();
 
   // The following conditions must be checked again after re-parsing, because
   // earlier the information might not have been complete due to lazy parsing.
   nodes_added = function->ast_node_count();
   if (nodes_added > Min(FLAG_max_inlined_nodes, kUnlimitedMaxInlinedNodes)) {
     TraceInline(target, caller, "target AST is too large [late]");
     return false;
   }
   if (function->dont_optimize()) {
@@ skipping 5236 matching lines @@
     isolate()->GetHTracer()->TraceHydrogen(name(), graph_);
   }
 
 #ifdef DEBUG
   graph_->Verify(false);  // No full verify.
 #endif
 }
 
 }  // namespace internal
 }  // namespace v8