[full-codegen] Eliminate unnecessary hole checks for stores

src/ast/ast.cc

 // 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.
 
 #include "src/ast/ast.h"
 
 #include <cmath>  // For isfinite.
 
 #include "src/ast/compile-time-value.h"
 #include "src/ast/prettyprinter.h"
@@ skipping 147 matching lines @@
       return false;
   }
 }
 
 VariableProxy::VariableProxy(Variable* var, int start_position,
                              int end_position)
     : Expression(start_position, kVariableProxy),
       end_position_(end_position),
       raw_name_(var->raw_name()),
       next_unresolved_(nullptr) {
-  bit_field_ |=
-      IsThisField::encode(var->is_this()) | IsAssignedField::encode(false) |
-      IsResolvedField::encode(false) | NeedsHoleCheckField::encode(false);
+  bit_field_ |= IsThisField::encode(var->is_this()) |
+                IsAssignedField::encode(false) |
+                IsResolvedField::encode(false) |
+                HoleCheckModeField::encode(HoleCheckMode::kElided);
   BindTo(var);
 }
 
 VariableProxy::VariableProxy(const AstRawString* name,
                              VariableKind variable_kind, int start_position,
                              int end_position)
     : Expression(start_position, kVariableProxy),
       end_position_(end_position),
       raw_name_(name),
       next_unresolved_(nullptr) {
   bit_field_ |= IsThisField::encode(variable_kind == THIS_VARIABLE) |
                 IsAssignedField::encode(false) |
                 IsResolvedField::encode(false) |
-                NeedsHoleCheckField::encode(false);
+                HoleCheckModeField::encode(HoleCheckMode::kElided);
 }
 
 VariableProxy::VariableProxy(const VariableProxy* copy_from)
     : Expression(copy_from->position(), kVariableProxy),
       end_position_(copy_from->end_position_),
       next_unresolved_(nullptr) {
   bit_field_ = copy_from->bit_field_;
   DCHECK(!copy_from->is_resolved());
   raw_name_ = copy_from->raw_name_;
 }
@@ skipping 752 matching lines @@
 // static
 bool Literal::Match(void* literal1, void* literal2) {
   const AstValue* x = static_cast<Literal*>(literal1)->raw_value();
   const AstValue* y = static_cast<Literal*>(literal2)->raw_value();
   return (x->IsString() && y->IsString() && x->AsString() == y->AsString()) ||
          (x->IsNumber() && y->IsNumber() && x->AsNumber() == y->AsNumber());
 }
 
 }  // namespace internal
 }  // namespace v8