[turbofan] Improve code generation for unordered comparisons.

src/compiler/instruction.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/compiler/graph.h"
 #include "src/compiler/instruction.h"
 
 namespace v8 {
 namespace internal {
@@ skipping 234 matching lines @@
     case kUnsignedGreaterThanOrEqual:
       return os << "unsigned greater than or equal";
     case kUnsignedLessThanOrEqual:
       return os << "unsigned less than or equal";
     case kUnsignedGreaterThan:
       return os << "unsigned greater than";
     case kUnorderedEqual:
       return os << "unordered equal";
     case kUnorderedNotEqual:
       return os << "unordered not equal";
-    case kUnorderedLessThan:
-      return os << "unordered less than";
-    case kUnorderedGreaterThanOrEqual:
-      return os << "unordered greater than or equal";
-    case kUnorderedLessThanOrEqual:
-      return os << "unordered less than or equal";
-    case kUnorderedGreaterThan:
-      return os << "unordered greater than";
     case kOverflow:
       return os << "overflow";
     case kNotOverflow:
       return os << "not overflow";
   }
   UNREACHABLE();
   return os;
 }
 
 
@@ skipping 428 matching lines @@
       os << " B" << succ_block->id();
     }
     os << "\n";
   }
   return os;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8