[lldb] Remove the Swift-specific diagnosis frame callback #10685
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This feature was originally added to communicate Swift module import failures in per-module SwiftASTContext instances powering "frame variable" to the user. We no longer rely on per-module SwiftASTContexts so it's no longer needed to store these diagnostics long-term to display them to all debuggers using the same lldb::Module. Instead this patch diagnoses them immediately using Debugger::ReportWarning/Error, and since they can only happen when setting up an expression evaluator, they will also be displayed in a timely manner.
rdar://150066908