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FinishThunk, and the invariant of setting and then unsetting
CurCodeDecl, was added in 7f416cc42638 (2015). The invariant didn't
exist when I added this musttail codepath in ab2090d10765 (2014).
Recently in 28328c3771, I started using this codepath on non-Windows
platforms, and users reported problems during release testing (PR44987).
The issue was already present for users of EH on i686-windows-msvc, so I
added a test for that case as well.
Reviewed By: hans
Differential Revision: https://reviews.llvm.org/D76444
(cherry picked from commit ce5173c0e174870934d1b3a026f631d996136191)
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