[ignition] Use more-targeted check for CONST-this-initialization hole check

src/interpreter/bytecode-generator.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-generator.h"
 
 #include "src/ast/compile-time-value.h"
 #include "src/ast/scopes.h"
 #include "src/code-stubs.h"
 #include "src/compilation-info.h"
@@ skipping 1927 matching lines @@
   builder()
       ->JumpIfNotHole(&reference_error)
       .Jump(&no_reference_error)
       .Bind(&reference_error);
   BuildThrowReferenceError(name);
   builder()->Bind(&no_reference_error);
 }
 
 void BytecodeGenerator::BuildHoleCheckForVariableAssignment(Variable* variable,
                                                             Token::Value op) {
-  if (op != Token::INIT) {
-    // Perform an initialization check for let/const declared variables.
-    // E.g. let x = (x = 20); is not allowed.
-    BuildThrowIfHole(variable->name());
-  } else {
-    DCHECK(variable->is_this() && variable->mode() == CONST &&
-           op == Token::INIT);
+  if (variable->is_this() && variable->mode() == CONST && op == Token::INIT) {
     // Perform an initialization check for 'this'. 'this' variable is the
     // only variable able to trigger bind operations outside the TDZ
     // via 'super' calls.
     BuildThrowIfNotHole(variable->name());
+  } else {
+    // Perform an initialization check for let/const declared variables.
+    // E.g. let x = (x = 20); is not allowed.
+    DCHECK(IsLexicalVariableMode(variable->mode()));
+    BuildThrowIfHole(variable->name());
   }
 }
 
 void BytecodeGenerator::BuildVariableAssignment(Variable* variable,
                                                 Token::Value op,
                                                 FeedbackVectorSlot slot,
                                                 HoleCheckMode hole_check_mode) {
   VariableMode mode = variable->mode();
   RegisterAllocationScope assignment_register_scope(this);
   BytecodeLabel end_label;
@@ skipping 1235 matching lines @@
 }
 
 Runtime::FunctionId BytecodeGenerator::StoreKeyedToSuperRuntimeId() {
   return is_strict(language_mode()) ? Runtime::kStoreKeyedToSuper_Strict
                                     : Runtime::kStoreKeyedToSuper_Sloppy;
 }
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8