[regexp] Fix check for FLAG_harmony_regexp_dotall

src/builtins/builtins-regexp-gen.cc

Index: src/builtins/builtins-regexp-gen.cc
diff --git a/src/builtins/builtins-regexp-gen.cc b/src/builtins/builtins-regexp-gen.cc
index ee49d8d16bc18a0c9d3dd19b26efbf732f3fd596..b76ee8cec7b39e78592459f93a3702bae43dd6db 100644
--- a/src/builtins/builtins-regexp-gen.cc
+++ b/src/builtins/builtins-regexp-gen.cc
@@ -1368,8 +1368,8 @@ TF_BUILTIN(RegExpPrototypeMultilineGetter, RegExpBuiltinsAssembler) {
 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