[VM] Fix RegExp_ExecuteMatch to return List<int> instead of List<dynamic>.

Fixes #31307

Bug:
Change-Id: Ied39fd616a492d9872fe7676202e4dc497d1ee17
Reviewed-on: https://dart-review.googlesource.com/20780
Reviewed-by: Martin Kustermann <[email protected]>
Commit-Queue: Vyacheslav Egorov <[email protected]>

Author: mraleph

runtime/vm/regexp_assembler_ir.cc

@@ -241,8 +241,8 @@ void IRRegExpMacroAssembler::GenerateSuccessBlock() {
   set_current_instruction(success_block_);
   TAG();
 
-  Value* type = Bind(new (Z) ConstantInstr(
-      TypeArguments::ZoneHandle(Z, TypeArguments::null())));
+  Value* type = Bind(new (Z) ConstantInstr(TypeArguments::ZoneHandle(
+      Z, Isolate::Current()->object_store()->type_argument_int())));
   Value* length = Bind(Uint64Constant(saved_registers_count_));
   Value* array = Bind(new (Z) CreateArrayInstr(TokenPosition::kNoSource, type,
                                                length, GetNextDeoptId()));