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440ff11501
Previously line table symbol was represented as `DIE::value_iterator` inside `DwarfCompileUnit` and subsequent function `intStmtList` was used to create a local `MCSymbol` to initialize it. This patch removes `DIE::value_iterator` from `DwarfCompileUnit` and intoduce `MCSymbol` for representing this units symbol for `debug_line` section. As a result `applyStmtList` is also modified to utilize this. Further more a helper function `getLineTableStartSym` is also introduced to get this symbol, this would be used by clients which need to access this line table, i.e `debug_macro`. Reviewed By: dblaikie Differential Revision: https://reviews.llvm.org/D77489
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