Abid Qadeer db64e69fa2 [flang][debug] Handle 'used' module. (#107626) ...

As described in #98883, we have to qualify a module variable name in
debugger to get its value. This PR tries to remove this limitation.
    
LLVM provides `DIImportedEntity` to handle such cases but the PR is made
more complicated due to the following 2 issues.
    
1. The MLIR attributes are readonly and we have a circular dependency
here. This has to be handled using the recursive interface provided by
the MLIR. This requires us to first create a place holder
`DISubprogramAttr` which is used in creating `DIImportedEntityAttr`.
Later another `DISubprogramAttr` is created which replaces the place
holder.
    
2. The flang IR does not provide any information about the 'used' module
so this has to be extracted by doing a pass over the
`DeclareOp` in the function. This presents certain limitation as 'only'
and module variable renaming may not be handled properly.
    
Due to the change in `DISubprogramAttr`, some tests also needed to be
adjusted.
    
Fixes #98883.

2024-09-11 09:31:53 +01:00

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