[turbofan] Slighly improve JSCreateArguments lowering.

src/compiler/js-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/js-operator.h"
 
 #include <limits>
 
 #include "src/base/lazy-instance.h"
 #include "src/compiler/opcodes.h"
@@ skipping 689 matching lines @@
   return new (zone()) Operator1<ContextAccess>(  // --
       IrOpcode::kJSStoreContext,                 // opcode
       Operator::kNoRead | Operator::kNoThrow,    // flags
       "JSStoreContext",                          // name
       2, 1, 1, 0, 1, 0,                          // counts
       access);                                   // parameter
 }
 
 
 const Operator* JSOperatorBuilder::CreateArguments(CreateArgumentsType type) {
-  return new (zone()) Operator1<CreateArgumentsType>(    // --
-      IrOpcode::kJSCreateArguments, Operator::kNoThrow,  // opcode
-      "JSCreateArguments",                               // name
-      1, 1, 1, 1, 1, 0,                                  // counts
-      type);                                             // parameter
+  return new (zone()) Operator1<CreateArgumentsType>(         // --
+      IrOpcode::kJSCreateArguments, Operator::kEliminatable,  // opcode
+      "JSCreateArguments",                                    // name
+      1, 1, 0, 1, 1, 0,                                       // counts
+      type);                                                  // parameter
 }
 
 
 const Operator* JSOperatorBuilder::CreateArray(size_t arity,
                                                Handle<AllocationSite> site) {
   // constructor, new_target, arg1, ..., argN
   int const value_input_count = static_cast<int>(arity) + 2;
   CreateArrayParameters parameters(arity, site);
   return new (zone()) Operator1<CreateArrayParameters>(   // --
       IrOpcode::kJSCreateArray, Operator::kNoProperties,  // opcode
@@ skipping 84 matching lines @@
   return new (zone()) Operator1<Handle<ScopeInfo>>(               // --
       IrOpcode::kJSCreateScriptContext, Operator::kNoProperties,  // opcode
       "JSCreateScriptContext",                                    // name
       1, 1, 1, 1, 1, 2,                                           // counts
       scpope_info);                                               // parameter
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8