[3.14] gh-154194: Degrade frames instead of failing the sample (GH-154195) - #158833
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(cherry picked from commit 7d25916) Co-authored-by: Pablo Galindo Salgado <pablogsal@gmail.com>
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Backport of #154195 to 3.14. Apply the fallback to the older single-file unwinder and keep its FrameInfo.lineno API and 4096-byte linetable limit. Allocate fallback names locally to preserve the stable runtime layout. Sampling binary tests do not apply to this branch. The dead-process assertion is Linux-only because the 3.14 macOS reader does not raise ProcessLookupError.
External inspection and asyncio tools tests pass on debug and free-threaded builds (43 tests; 2 and 1 skipped), including oversized metadata with debug ranges disabled.
(cherry picked from commit 7d25916)
_remote_debugging: Degrade gracefully reads instead of failing the whole read completely #154194