Enable inoutset dependency-type in depend clause.

Done in manner similar to mutexinoutset
(see https://reviews.llvm.org/D57576)

Runtime support already exists in LLVM OpenMP runtime (see
https://reviews.llvm.org/D97085).

The value used to identify an inoutset dependency type in the LLVM
OpenMP runtime is 8.

Some tests updated due to change in dependency type error messages that
now include new dependency type. Also updated
test/OpenMP/task_codegen.cpp to verify we emit the right code.