`get_or_create_type_array` was used on a non-type MDNode.
Add interface for `get_or_create_array` and use that instead.
Differential Revision: https://reviews.llvm.org/D99450
In the process of adding the tests, several bugs were
found in the implementation and interface of the API
and they were fixed.
Some utilities from the core tests (core.ml) were moved
into a separate file for reuse.
The following new functions have been added:
`dibuild_create_global_variable_expression`,
`dibuild_create_constant_value_expression` and
`llmetadata_null`. The third one already existed but
is now exposed publicly.
Differential Revision: https://reviews.llvm.org/D99403
Many (but not all) DebugInfo functions are now added to the
OCaml bindings, and rest can be safely added incrementally.
Differential Revision: https://reviews.llvm.org/D90831
