[OpenMP] Strengthen regression tests for task allocation under nowait depend clauses NFC

Summary:
This patch strengthens the tests introduced in D63009 by:
- adding new test for default device ID.
- modifying existing tests to pass device ID local variable to the task allocation function.

Reviewers: ABataev, Hahnfeld, caomhin, jdoerfert

Reviewed By: ABataev

Subscribers: guansong, jdoerfert, cfe-commits

Tags: #clang

Differential Revision: https://reviews.llvm.org/D63454

llvm-svn: 363809