Added more tests for compiled async methods.
Added more tests for compiled async methods.

(cherry picked from commit 64a5b73eb3a6e367876902c6eda7c8eebb1b14d7)

linq2db/linq2db,LinqToDB4iSeries/linq2db,linq2db/linq2db,LinqToDB4iSeries/linq2db,MaceWindu/linq2db,MaceWindu/linq2db