[SymbolGraph] consider underscored symbols as private
if they're internal
#41156
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Resolves rdar://86294802
When generating a symbol graph, symbols that are prefixed with an underscore are always treated as
internal
, regardless of what their original access level is. However, there are more nuanced semantics for underscored symbols that are alreadyinternal
or lower - these should be treated asprivate
for the purposes of theminimum-access-level
option. This PR updates the filtering logic to not emitinternal
underscored symbols unless you specifically request aprivate
-level symbol graph.