new StackFrame objects created in StackFrameList::GetFramesUpTo are constructed with SymbolContext set to nullptr, except for inline frames. Calling the ctor with nullptr causes StackFrame::GetSymbolContext to apply the target.source-map to line_entry.file. Calling it with a valid SC will cause line_entry.file to have the original file from the DWARF info, so the file comparison in ThreadPlanStepRange::InRange will fail when it should succeed.
This patch adds the mapping from StackFrame::GetSymbolContext to the inline frame case in StackFrameList::GetFramesUpTo.