[es6] implement spread calls

src/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/hydrogen.h"
 
 #include <sstream>
 
 #include "src/v8.h"
 
@@ skipping 11010 matching lines @@
     DCHECK_EQ(Token::EQ, expr->op());
     Type* type = expr->combined_type()->Is(Type::None())
         ? Type::Any(zone()) : expr->combined_type();
     HIfContinuation continuation;
     BuildCompareNil(value, type, &continuation);
     return ast_context()->ReturnContinuation(&continuation, expr->id());
   }
 }
 
 
+void HOptimizedGraphBuilder::VisitSpread(Spread* expr) { UNREACHABLE(); }

[Dmitry Lomov (no reviews), 2015/04/02 07:54:20]

One thing I am missing: why this is never hit?

[caitp (gmail), 2015/04/02 13:03:51]

the Spread nodes are removed from the graph, they're only really useful for
helping desugaring, currently

+
+
 HInstruction* HOptimizedGraphBuilder::BuildThisFunction() {
   // If we share optimized code between different closures, the
   // this-function is not a constant, except inside an inlined body.
   if (function_state()->outer() != NULL) {
       return New<HConstant>(
           function_state()->compilation_info()->closure());
   } else {
       return New<HThisFunction>();
   }
 }
@@ skipping 2359 matching lines @@
   if (ShouldProduceTraceOutput()) {
     isolate()->GetHTracer()->TraceHydrogen(name(), graph_);
   }
 
 #ifdef DEBUG
   graph_->Verify(false);  // No full verify.
 #endif
 }
 
 } }  // namespace v8::internal