CUDA: add conditions as predicates tests\n\nAdds kernel-based tests f…

[CodersAcademy006]

This PR adds kernel-based tests for device-side boolean conditions in Numba-CUDA:

• if with comparison predicates

• boolean arrays as conditions

• nested predicates

• else branches

• constant predicates

Tests are skipped under cudasim due to divergent semantics, and NumPy is used as the reference oracle. The scope is intentionally limited to safe, well-defined CUDA predicate lowering (no Python truthiness, short-circuit logic, or object conditions).

This continues the systematic porting of CPU-side tests to CUDA, directly contributing to issue #515.

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[greptile-apps]

Greptile Summary

This PR adds comprehensive test coverage for CUDA device-side boolean conditions and predicate lowering, directly contributing to issue #515.

The new test file includes:

• Comparison operator predicates (greater-than, equality)
• Boolean arrays as conditions
• Nested if-else predicates
• Constant predicates (if True)
• Proper use of @skip_on_cudasim decorator due to divergent semantics
• NumPy-based reference implementations for validation

The copyright header issue from the previous review has been addressed. All tests follow established patterns in the codebase with proper CUDA kernel structure, device memory management, and synchronization.

Confidence Score: 5/5

• This PR is safe to merge with minimal risk
• The PR adds well-structured test coverage for CUDA predicate lowering. All tests follow established patterns, use appropriate CUDA testing utilities, and include correct reference implementations using NumPy. The copyright header issue from previous review has been addressed. The code is clean, focused, and directly addresses issue Incomplete Test Coverage in Numba-CUDA #515.
• No files require special attention

Important Files Changed

Filename	Overview
numba_cuda/numba/cuda/tests/test_conditions_as_predicates.py	New test file for CUDA predicate lowering with proper header, well-structured tests covering comparison operators, boolean arrays, nested predicates, and constant predicates

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