[smart_holder] Simple experiment related to PR #4022#4028

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rwgk wants to merge 49 commits intopybind:smart_holderfrom

rwgk:odr_guard_sh__builtin_FILE_LINE_availability

Commits on Jun 12, 2022

Insert type_caster_odr_guard<> (an empty struct to start with).
rwgk
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Add odr_guard_registry() used in type_caster_odr_guard() default constructor.
rwgk
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Add minimal_real_caster (from PR #3862) to test_async, test_buffers
rwgk
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Commits on Jun 14, 2022

VERY MESSY SNAPSHOT of WIP, this was the starting point for cl/454658864, which has more changes on top.
rwgk
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Commits on Jun 21, 2022

Commits on Jun 22, 2022

Commits on Jun 23, 2022

Commits on Jun 24, 2022

try_builtin_file_line() just to probe what compilers support it.
rwgk
committed