[flang][debug] Generate DWARF debug info using fir.use_stmt. #168541
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This patch adds infrastructure to emit Fortran USE statement information in FIR, which will be used by subsequent patches to generate DWARF debug information. The information about use statement is collected during semantic analysis and stored in PreservedUseStmt objects. During lowering, fir.use_stmt operations are emitted for each PreservedUseStmt object. The fir.use_stmt operation captures the module name, ONLY list symbols, and any renames specified in the USE statement.
This patch uses the fir.use_stmt operations to generate correct debug metadata for use statement when `only` and `=>` are used. The debug flow is changed a bit where we process the module globals first so that we have the global variables when we start to process fir.use_stmt. There was another small cleanup that same ID is used in both the placeholder and the actual DISubprogramAttr.
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🐧 Linux x64 Test Results
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This PR uses the information generated in #168106 to generate correct debug metadata for use statement when
onlyand=>are used.The debug flow is changed a bit where we process the module globals first so that we have the global variables when we start to process
fir.use_stmt. There was another small cleanup that same ID is used in both the placeholder and the actualDISubprogramAttr.