[turbofan] Make RawMachineAssembler handle the end node.

src/compiler/common-operator.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/common-operator.h"
 
 #include "src/assembler.h"
 #include "src/base/lazy-instance.h"
 #include "src/compiler/linkage.h"
 #include "src/compiler/opcodes.h"
@@ skipping 381 matching lines @@
                control_input_count, value_output_count, effect_output_count, \
                control_output_count)                                         \
   const Operator* CommonOperatorBuilder::Name() {                            \
     return &cache_.k##Name##Operator;                                        \
   }
 CACHED_OP_LIST(CACHED)
 #undef CACHED
 
 
 const Operator* CommonOperatorBuilder::End(size_t control_input_count) {
-  DCHECK_NE(0u, control_input_count);  // Disallow empty ends.
   switch (control_input_count) {
 #define CACHED_END(input_count) \
   case input_count:             \
     return &cache_.kEnd##input_count##Operator;
     CACHED_END_LIST(CACHED_END)
 #undef CACHED_END
     default:
       break;
   }
   // Uncached.
@@ skipping 396 matching lines @@
     Handle<SharedFunctionInfo> shared_info,
     ContextCallingMode context_calling_mode) {
   return new (zone()->New(sizeof(FrameStateFunctionInfo)))
       FrameStateFunctionInfo(type, parameter_count, local_count, shared_info,
                              context_calling_mode);
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8