#1312 ScalarArray code generation

[mo-alistairp]

Adding code generation for ScalarArrays (towards #1312 ). The metadata support was added in #2173.

[arporter]

This isn't true I'm afraid - they will need to be added to a data region. However, you could leave this as a TODO as I'm not sure we're ever going to need data regions.

[mo-alistairp]

Thanks for that - it's currently a very rough draft so some of the comments are currently just borrowed from other functions. But, I will definitely note that down!

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.89%. Comparing base (3bdcde7) to head (5133a3c).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3101      +/-   ##
==========================================
- Coverage   99.89%   99.89%   -0.01%     
==========================================
  Files         375      376       +1     
  Lines       53111    53242     +131     
==========================================
+ Hits        53057    53187     +130     
- Misses         54       55       +1     

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[mo-alistairp]

This still isn't working as intended, but is getting closer to correct. As an example, the code gen is now adding the scalar arrays to the generated code, alongside the arrays containing their dimensions. However, it is not adding these dimensions to the generated code (e.g., no dimensions(...) mention). It is also assigning the field as intent(in) right now, which it shouldn't do either.

Furthermore, the stub_gen test is failing because we are currently adding the dimensions array to the psyir layer as an ArgumentInteraface which isn't there as an argument at the call. Need to find a way around this. I'm wondering if we need a dimensions array at all but I'll have to investigate that further.

[mo-alistairp]

I think this is now ready for review. The code gen and stub gen seem to be performing as I would expect. I've added test coverage for everything I've added. Everything is passing the style checks.