[2020-02] transform sgen_get_descriptor to parallel safe version in job_major_mod_union_preclean #21391
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…od_union_preclean fixes #21369 job_major_mod_union_preclean can race with the tarjan bridge implementation that changes the vtable pointer by settings the three lower bits. this results in invalid loading of the vtable (shifted by 7 bytes) which in turn give a wrong desc to the scan functions This change is released under the MIT license.
lambdageek
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grendello
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Fixes: dotnet#6546 Context: mono/mono#21391 Changes: * transform sgen_get_descriptor to parallel safe version in job_major_mod_union_preclean (#21391)
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Backport of #21384 to 2020-02
Related to dotnet/android#6546
/cc @lambdageek @tmijieux