[OpenMP][Tools] Fix Archer handling of task dependencies

The current handling of dependencies in Archer has two flaws:

- annotation of dependency synchronization is not limited to sibling tasks
- annotation of in/out dependencies is based on the assumption, that dependency
  variables will rarely be byte-sized variables.

This patch introduces a map in the generating task to manage the dependency
variables for the child tasks. The map is only accesses from the generating
task, so no locking is necessary. This also limits the dependency-based
synchronization to sibling tasks.
This patch also introduces proper handling for new dependency types such as
mutexinoutset and inoutset.

Differential Revision: https://reviews.llvm.org/D103608

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