[Interpreter] Optimize code of the form 'if (x === undefined)'.

src/interpreter/bytecode-array-writer.cc

 // Copyright 2015 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/interpreter/bytecode-array-writer.h"
 
 #include "src/api.h"
 #include "src/interpreter/bytecode-label.h"
 #include "src/interpreter/bytecode-register.h"
 #include "src/interpreter/constant-array-builder.h"
@@ skipping 144 matching lines @@
     case Bytecode::kJumpIfFalse:
       return Bytecode::kJumpIfFalseConstant;
     case Bytecode::kJumpIfToBooleanTrue:
       return Bytecode::kJumpIfToBooleanTrueConstant;
     case Bytecode::kJumpIfToBooleanFalse:
       return Bytecode::kJumpIfToBooleanFalseConstant;
     case Bytecode::kJumpIfNotHole:
       return Bytecode::kJumpIfNotHoleConstant;
     case Bytecode::kJumpIfNull:
       return Bytecode::kJumpIfNullConstant;
+    case Bytecode::kJumpIfNotNull:
+      return Bytecode::kJumpIfNotNullConstant;
     case Bytecode::kJumpIfUndefined:
       return Bytecode::kJumpIfUndefinedConstant;
+    case Bytecode::kJumpIfNotUndefined:
+      return Bytecode::kJumpIfNotUndefinedConstant;
     case Bytecode::kJumpIfJSReceiver:
       return Bytecode::kJumpIfJSReceiverConstant;
     default:
       UNREACHABLE();
       return Bytecode::kIllegal;
   }
 }
 
 void BytecodeArrayWriter::PatchJumpWith8BitOperand(size_t jump_location,
                                                    int delta) {
@@ skipping 147 matching lines @@
         node->update_operand0(k32BitJumpPlaceholder);
         break;
     }
   }
   EmitBytecode(node);
 }
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8