[flang][debug] Generate DWARF debug info using fir.use_stmt. (#168541)
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`.
Fixes #160923.
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