[flang] Revert recent addition of ActualArgument::PassedObject

reformatting

Complete merging with current master

implement extension of inherited type-bound generics

Original-commit: flang-compiler/f18@e58c4e53c2fcf6559e7254ce0fd1e4b96d158c73
Reviewed-on: https://github.com/flang-compiler/f18/pull/864