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Scripted frames that materialize Python functions are PC-less by design, meaning they don't have valid address ranges. Previously, LineEntry::IsValid() required both a valid address range and a line number, preventing scripted frames from creating valid line entries for these synthetic stack frames. Relaxing this requirement is necessary since `SBSymbolContext::SetLineEntry` will first check if the LineEntry is valid and discard it otherwise. This change introduces an `synthetic` flag that gets set when LineEntry objects are created or modified through the SBAPI (specifically via SetLine). When this flag is set, IsValid() no longer requires a valid address range, only a valid line number. This is risk-free because the flag is only set for LineEntry objects created through the SBAPI, which are primarily used by scripted processes and frames. Regular debug information-derived line entries continue to require valid address ranges. Signed-off-by: Med Ismail Bennani <ismail@bennani.ma>