Reapply "Refactor external_assembly_probe
to be separate from single-file bundle probing"
#113776
+273
−147
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Undo the revert in #113738
0d3c852 is the change on top of the original that should address dotnet/source-build#4952.
Make a copy of the host contract information on initialization instead of just operating on a pointer to the struct. This should address intermittent failures on shutdown where a thread is still running after
coreclr_shutdown
has completed and the actual contract struct provided by a host may be cleaned up. The assumption is that any function pointers provided on the host contract at initialization should remain valid for the process lifetime.