[full-codegen] Eliminate unnecessary hole checks for stores

src/globals.h

 // Copyright 2012 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.
 
 #ifndef V8_GLOBALS_H_
 #define V8_GLOBALS_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 1031 matching lines @@
 // V8 allows const declarations in global code with distinct creation and
 // initialization steps which are represented by non-writable properties in the
 // global object. As a result also these bindings need to be checked for
 // initialization.
 //
 // The following enum specifies a flag that indicates if the binding needs a
 // distinct initialization step (kNeedsInitialization) or if the binding is
 // immediately initialized upon creation (kCreatedInitialized).
 enum InitializationFlag : uint8_t { kNeedsInitialization, kCreatedInitialized };
 
+enum class HoleCheckMode { kRequired, kElided };
+
 enum MaybeAssignedFlag : uint8_t { kNotAssigned, kMaybeAssigned };
 
 // Serialized in PreparseData, so numeric values should not be changed.
 enum ParseErrorType { kSyntaxError = 0, kReferenceError = 1 };
 
 
 enum MinusZeroMode {
   TREAT_MINUS_ZERO_AS_ZERO,
   FAIL_ON_MINUS_ZERO
 };
@@ skipping 206 matching lines @@
   UNREACHABLE();
   return os;
 }
 
 }  // namespace internal
 }  // namespace v8
 
 namespace i = v8::internal;
 
 #endif  // V8_GLOBALS_H_