db64e69fa2
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.
Flang Integration Tests
This directory can be used to add Integration tests involving multiple stages of the compiler (for eg. from Fortran to LLVM IR). It should not contain executable tests. We should only add tests here sparingly and only if there is no other way to test. Repeat this message in each test that is added to this directory and sub-directories.