[regexp] Fix check for FLAG_harmony_regexp_dotall

src/builtins/builtins-regexp-gen.cc

 // Copyright 2017 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/builtins/builtins-regexp-gen.h"
 
 #include "src/builtins/builtins-constructor-gen.h"
 #include "src/builtins/builtins-utils-gen.h"
 #include "src/builtins/builtins.h"
 #include "src/code-factory.h"
@@ skipping 1350 matching lines @@
   Node* context = Parameter(Descriptor::kContext);
   Node* receiver = Parameter(Descriptor::kReceiver);
   FlagGetter(context, receiver, JSRegExp::kMultiline,
              v8::Isolate::kRegExpPrototypeOldFlagGetter,
              "RegExp.prototype.multiline");
 }
 
 Node* RegExpBuiltinsAssembler::IsDotAllEnabled(Isolate* isolate) {
   Node* flag_ptr = ExternalConstant(
       ExternalReference::address_of_regexp_dotall_flag(isolate));
-  Node* flag_value = Load(MachineType::IntPtr(), flag_ptr);
-  return WordNotEqual(flag_value, IntPtrConstant(0));
+  Node* const flag_value = Load(MachineType::Int8(), flag_ptr);
+  return Word32NotEqual(flag_value, Int32Constant(0));
 }
 
 // ES #sec-get-regexp.prototype.dotAll
 TF_BUILTIN(RegExpPrototypeDotAllGetter, RegExpBuiltinsAssembler) {
   Node* context = Parameter(Descriptor::kContext);
   Node* receiver = Parameter(Descriptor::kReceiver);
   static const int kNoCounter = -1;
   CSA_ASSERT(this, IsDotAllEnabled(isolate()));
   FlagGetter(context, receiver, JSRegExp::kDotAll, kNoCounter,
              "RegExp.prototype.dotAll");
@@ skipping 1342 matching lines @@
   Bind(&if_matched);
   {
     Node* result =
         ConstructNewResultFromMatchInfo(context, regexp, match_indices, string);
     Return(result);
   }
 }
 
 }  // namespace internal
 }  // namespace v8