[LLDB][PDB] Access object file through module (#169728) When a PDB is loaded through `target symbols add <pdb-path>`, its `m_objectfile_sp` is an `ObjectFilePDB` instead of `ObjectFilePECOFF` (the debugged module). In both the native and DIA plugin, some paths assumed that `m_objectfile_sp` is the debugged module. With this PR, they go through `m_objfile_sp->GetModule()->GetObjectFile()`. For the DIA plugin, this lead to an assertion failure (https://github.com/llvm/llvm-project/issues/169628#issuecomment-3582555277) and for both plugins, it meant that the symbol table wasn't loaded.
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